Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c8274ae3a6c040…

MALICIOUS

PDF

45.3 KB Created: 2020-08-10 07:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: afcd6d544b72b317a1a2662853414922 SHA-1: ad05b443bf01c36da56a277ea342117a85c41097 SHA-256: 37c8274ae3a6c040ef26131d681d2bba323b33a70a0ee61d65c0af973959120b
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.ru/pify?keyword=credit+scorecard+pdf`. This URL is part of a link farm designed to host numerous SEO-optimized PDF files, likely as a lure. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the primary malicious URL and several benign-looking Shopify URLs, suggesting a social engineering attempt to redirect users to malicious infrastructure.

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=credit+scorecard+pdf In PDF document text
    • http://tofesoxu.paperlessconstruct.com/uploads/1/3/1/3/131380429/a708e4582bf00a0.pdfIn PDF document text
    • http://teluwe.agusablinds.com/uploads/1/3/2/3/132303382/wedumovelibumiteb.pdfIn PDF document text
    • http://files.passionforthearts.org/uploads/1/3/0/7/130775337/jogudazukivat-vubobixud-rovuzokizew-pelinorokodum.pdfIn PDF document text
    • http://files.shadysideofthetracks.com/uploads/1/3/1/4/131406762/9744250.pdfIn PDF document text
    • http://files.redwooddogs.com/uploads/1/3/1/8/131856108/lajisoxov.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/1/0431/4634/6658/files/addition_with_regrouping_worksheets_grade_2_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/lubuwagafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8035/1897/files/54805281490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/associer_2_fichiers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/tofuvuzeretovima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/deep_breathing_exercises_for_anxiety.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/buzosofoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/bemikexamasudavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/marvel_all_characters_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/solexorulikuwitobomowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/zorobetakadakamabeseg.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_off0000737a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x737A 5024 bytes
SHA-256: 9a5160fb52f888e55601ed7187d30c4526eefe22ea1a04cbc3f182a7961d54e0
font_01_sfnt_off0000849d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849D 10404 bytes
SHA-256: 817106a7169fe5cc9d17ac314eac30cf6d61ded498e76659316db510d641deee