Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b5f974a003d081…

MALICIOUS

PDF

44.1 KB Created: 2020-08-08 10:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9ce0606d7f38faff2ede07ad54bab483 SHA-1: 0312e55bcf255b616ce04c6149759c266877dca5 SHA-256: c5b5f974a003d081c66019f1a984f639cc43ba3007446cfde385a6cf544a233f
234 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent link, 'https://ttraff.ru/pify?keyword=adobe+acrobat+pdf+reader+free+download+for+windows+10', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading Adobe Acrobat Reader, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

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/pify?keyword=adobe+acrobat+pdf+reader+free+download+for+windows+10 In PDF document text
    • http://fabugera.exoticfeeders.com/uploads/1/3/1/0/131071157/pevigadoxakov.pdfIn PDF document text
    • http://files.kemsgymanddance.com/uploads/1/3/0/7/130739693/c493b37201aede.pdfIn PDF document text
    • http://files.thebaptistchurchoffranklin.com/uploads/1/3/0/7/130775076/7032302.pdfIn PDF document text
    • http://files.holysmokescountrybbqandcatering.com/uploads/1/3/2/7/132740343/9696054.pdfIn PDF document text
    • http://files.mansbestpetsitting.com/uploads/1/3/2/3/132302993/1457897.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/1/0434/1248/8343/files/rujiwepazapupibiboduz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3855/5805/files/3874062293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4381/3538/files/nevuvedejejosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8583/7989/files/convertir_un_escaneado_a_un_word_editable_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/wetuzubunowiwubuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/20023144370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/4973459542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2329/2840/files/tuxidoxabajasejefuvonegej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3096/0536/files/goririjolugasaxanuviret.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/mathematical_statistics_and_data_analysis_solutions_manual.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_off00006b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B13 5564 bytes
SHA-256: a5282dd658387e0132e6d22978391e1a849e5b4ed70361609704b8a3b7667d22
font_01_sfnt_off00007e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E25 11416 bytes
SHA-256: d340382174d4557377987c3fc8f1df11fcd3993bc31f4439d2b6102f1a4fc804