Malicious PDF — malware analysis report

Static analysis result for SHA-256 91413e9c4830bcb0…

MALICIOUS

PDF

51.0 KB Created: 2020-08-06 10:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6cec9db94249a634a3e8f007c8e940e9 SHA-1: 63aebf0e7bae53e9136aa7821a051fdefdff9b7e SHA-256: 91413e9c4830bcb094fde2b0af033c6e51a4e55ef1f6d5fcdf039b32faccf0ab
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, pointing to `https://ttraff.ru/pify?keyword=facebook+advertising+strategy+pdf`. This indicates the document is designed to trick users into visiting a malicious site, likely for phishing or malware distribution. The presence of numerous other external PDF links, many hosted on `cdn.shopify.com`, suggests a link farm or SEO poisoning tactic to obscure the malicious intent. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector is clearly the malicious redirector.

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=facebook+advertising+strategy+pdf In PDF document text
    • http://files.laurielotus.com/uploads/1/3/1/8/131856827/5448411.pdfIn PDF document text
    • http://files.crimsonsoccer.us/uploads/1/3/1/8/131856430/22e30e2834.pdfIn PDF document text
    • http://files.drjessicabc.com/uploads/1/3/0/9/130968921/8218905.pdfIn PDF document text
    • http://files.creativationevents.com/uploads/1/3/1/4/131437671/5999326.pdfIn PDF document text
    • http://files.movingforwardglancingback.com/uploads/1/3/1/0/131070845/xivafojiduj.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/1/0434/5652/8541/files/zokafixafovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5689/6927/files/71940470752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/uppsc_sociology_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/91100162508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/fadunafekamonaveruzexori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/xovavawiwazuxik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/fulunukorumoretar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/imagej_scale_bar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/24125254090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/hobbit_fan_edit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8502/8775/files/computer_architecture_book_free_download.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_off000087e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E2 5612 bytes
SHA-256: c5d633c9cd6dc095447e53e081ece9450979bc35c177616ed74be3dc04990f9b
font_01_sfnt_off00009b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B11 10676 bytes
SHA-256: bfcc4c69177d770d8e8ae548f708ad577f48662e17426c5f690e588c0a37ce64