Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7856f632db99627…

MALICIOUS

PDF

44.3 KB Created: 2020-08-25 00:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5ef5eb56cd34fc4b156a02e60c73474b SHA-1: 86c1223b44d027d0de751fa089b0e75702f6a1cf SHA-256: b7856f632db99627cbbdb3a5f36b21a4f03e908ce4a1a49d58d7b08535ebc7b0
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly.

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/pify?keyword=grammar+worksheets+for+esl+learners In PDF document text
    • http://tobom.thejournalofpolitics.org/uploads/1/3/1/6/131606289/5862370.pdfIn PDF document text
    • http://files.startimepatisserie.com/uploads/1/3/1/6/131606046/rosufiwu.pdfIn PDF document text
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdfIn PDF document text
    • http://nemigat.atelier-do.com/uploads/1/3/1/3/131398091/sesojamudab.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/1/0438/6373/6485/files/tazada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/xexugipesufemug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/fusese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/nikafumiluvizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/stay_rihanna_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/susupovezukam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/41491044487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/korean_english_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/91423364767.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 8

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_off0000706a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 5192 bytes
SHA-256: a7b02c992c25cf1f0657fe2dc31d93be727f5d5785be9211ef9e70fbde037d54
font_01_sfnt_off0000820a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 10060 bytes
SHA-256: 380b3cbcc13a3e2c5336ac6f552b9dcb6a57deb8c318b8b1bc153164943d5b54

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