Malicious PDF — malware analysis report

Static analysis result for SHA-256 55262522c517a5e6…

MALICIOUS

PDF

56.7 KB Created: 2020-08-17 02:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38bf3101b50f7141390a42a06e9426b9 SHA-1: 53d010e51952842c65be2afa25437db6824b332d SHA-256: 55262522c517a5e6f4589b5b56daed1b4feff153f102f03d849f3db10c70dfaf
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=prostate+cancer+ppt'. Another critical heuristic indicates a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm for SEO manipulation or distribution. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and references to 'prostate cancer ppt', reinforcing the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=prostate+cancer+ppt
    • http://files.aimdistributing.net/uploads/1/3/1/4/131408415/d232645f979.pdf
    • http://files.seoulvibephangan.com/uploads/1/3/1/4/131453252/begejo-kupugumijo-pexorelifip.pdf
    • http://files.pnwcollective.com/uploads/1/3/1/0/131071114/zimopitawolaj_jojig_sojexoloduwuk_woxefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4680/files/vexepagovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9667/8301/files/17166654823.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/78054070086.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/58913086409.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2752/files/allardyce_nicoll_british_drama.pdf
    • https://cdn.shopify.com/s/files/1/0438/5944/3862/files/album_songs_telugu_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8236/files/50460432381.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76106621034.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/18._2_modern_evolutionary_classification_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/vebokagejofabixunudulu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1d5.bin
eb1841a3ba32cf53c2f75fdd4fbdfa2fc185612a002b568f5be4363e1b74a0d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D5 4896 bytes
font_01_sfnt_off0000b289.bin
aed85ec8c56b238413da9f0c6291d32322fa89a3a4e052355272c703f5fda57a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB289 10604 bytes