Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f89e32056e9a97…

MALICIOUS

PDF

65.8 KB Created: 2020-07-21 09:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: baff98c1fc11cbd3b68632e55467109b SHA-1: 53fbac3a3514a48fe146f30e9c5846c658cf2e3d SHA-256: 56f89e32056e9a979c447b34bc157c058a0434cb14405614ba3703a209ccaf1f
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to academic papers, reinforcing the lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=causes%20of%20migration%20in%20africa%20pdf In PDF document text
    • http://files.evanchambers.net/uploads/1/3/1/6/131606035/refezirex_nerimoxef_radiwuvo.pdfIn PDF document text
    • http://files.uconnpremedicalsocietynewsletter.com/uploads/1/3/1/4/131437247/4518692.pdfIn PDF document text
    • http://files.harderide.com/uploads/1/3/1/3/131397964/biwadirowiwu-tigil-zatobe-fuzenasagi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4859/8678/files/fipofusokusutodakiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/86336926471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/90280670494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/30317111076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/xusovonopexenivakikofuni.pdfIn PDF document text
    • https://rufumeridap.files.wordpress.com/2020/06/1791722409.pdfIn PDF document text
    • https://gerenulim.files.wordpress.com/2020/07/robivogilisoboganoxumabe.pdfIn PDF document text
    • https://volutabeni.files.wordpress.com/2020/06/22087463124.pdfIn PDF document text
    • https://jifumulunubi.files.wordpress.com/2020/06/ludijetesiwez.pdfIn PDF document text
    • https://kukokukaxu994053571.files.wordpress.com/2020/07/96605558211.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/nujesidabulaxojaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/4658476069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/66279384700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/purolipob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/fujotorenoporo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/zuxujenolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6517/2387/files/tereborekamam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/peribegadeled.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/zupifedok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 5348 bytes
SHA-256: fdfec750e3cd1cfd5e3001a1f54b113f0f4805ce1bcd2d8815171a259119822e
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 10112 bytes
SHA-256: b265a0d5f15ad804fc65bd4b4b4d4cb3f22cb4ba5ae3a8fedc74ab2c48a5f1c7

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