Malicious PDF — malware analysis report

Static analysis result for SHA-256 37836b101064a06e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-26 19:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 073a12104ec97f88998ca8c08489b525 SHA-1: 4340dd11610e912505c6ebb81b0c49e6aa14f4fc SHA-256: 37836b101064a06e79d7a2af7829edf495ecbdc964eabea4f5940290906f1786
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, includes text related to 'Past simple past continuous exercises pdf esl', suggesting a lure to disguise the malicious intent. The primary malicious URL is ttraff.ru, which is flagged as a redirector. The ML classifier also strongly indicated maliciousness.

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=past+simple+past+continuous+exercises+pdf+esl In PDF document text
    • http://penufawem.unlimitedpotentialstl.com/uploads/1/3/2/6/132681647/7313179.pdfIn PDF document text
    • http://files.phktsda.com/uploads/1/3/1/4/131438245/c53a9652.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/1/0433/0687/7080/files/xogasetixudaxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/mumuniniti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/dubarosikojematata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/nitro_free_download_full_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/29202058531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9903/6573/files/exam_booster_cambridge_pet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/rubewuba.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 3

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_off00005be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE3 5372 bytes
SHA-256: ed92639a506bbf45ab3b0754ef8fab0bf3cd9045c62c0ceefb6cf97549cb86cb
font_01_sfnt_off00006e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0A 10272 bytes
SHA-256: 7066a9627d25124962e7d172e5c386a0d65930117f463d9c1f49b456d72f7c36

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