Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1a8b89706583af…

MALICIOUS

PDF

47.9 KB Created: 2020-07-12 21:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 64825b719bde516122f78f5ac0304a62 SHA-1: d9623812d4139f57c659a6d45134704753b8faf8 SHA-256: 3f1a8b89706583affbfaf11deb0204449b0bec0a99119c7145f7f55899ee23d3
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF SEO link farm. One of these links, 'https://ttraff.ru/wb?keyword=define%20indirect%20tax%20pdf', points to known malicious redirector infrastructure. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=define%20indirect%20tax%20pdf In PDF document text
    • http://files.programsformindfulliving.org/uploads/1/3/0/7/130775009/giwinodumosowemi.pdfIn PDF document text
    • http://files.morstargar.com/uploads/1/3/2/6/132696335/puruve.pdfIn PDF document text
    • http://files.rosies-apothecary.com/uploads/1/3/2/7/132741064/e8a946b4.pdfIn PDF document text
    • http://files.lottiecreates.co.uk/uploads/1/3/0/7/130739107/100046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://buwosesem.files.wordpress.com/2020/07/18282458040.pdfIn PDF document text
    • https://megazotawulo183772260.files.wordpress.com/2020/07/58764163101.pdfIn PDF document text
    • https://kusujeseb640712054.files.wordpress.com/2020/07/26823845426.pdfIn PDF document text
    • https://jogapodu.files.wordpress.com/2020/07/jibijikeresifeloximazomir.pdfIn PDF document text
    • https://deriwekula.files.wordpress.com/2020/06/nibuwafoku.pdfIn PDF document text
    • https://mijukuwojaw.files.wordpress.com/2020/06/dametidabaxifiretumise.pdfIn PDF document text
    • https://rafopez.files.wordpress.com/2020/07/77112494495.pdfIn PDF document text
    • https://xevugonabaw.files.wordpress.com/2020/06/zusuzokedomelutit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/ruvajogeri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/tagagaxileluxuvogesetulan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/nezazabiminogurodit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/nituxipiwinoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0840/1316/files/siwesajanowunuxax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/sizazudelugo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC9 4684 bytes
SHA-256: 9ef5f96a559cb479af32a651868a365e34f2dace702aff01021e51242ea0aec0
font_01_sfnt_off00008cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBE 11216 bytes
SHA-256: d176bfc1ec3969adab97854a65d784cbe16a52508db62408b5ed80219256b90f