Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1d02641d2f8db0…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 22:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36782ad4184b08021a8d1454d62f16c1 SHA-1: 363c1fcd852625ed8e2bec841d122ff34ad1b53d SHA-256: 4e1d02641d2f8db0a16147f81185a5b5f5604e706e6824a6cb82dcbc4640a34f
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a "Tcs aptitude test questions and answers pdf". The document body and embedded URLs strongly suggest a phishing or social engineering attempt to redirect users to malicious content. The ML classifier also flagged this PDF with high confidence.

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.cc/pify?keyword=tcs+aptitude+test+questions+and+answers+pdf
    • http://guwifubej.newdayforthetao.com/uploads/1/3/0/7/130776542/nunabe.pdf
    • http://files.iraqi-poet.net/uploads/1/3/0/7/130739810/milaku-wirerewizup-wuzik.pdf
    • http://files.tankuanaw.com/uploads/1/3/0/8/130873851/7080183.pdf
    • http://files.paisanoperformance.com/uploads/1/3/0/8/130874067/139211.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/gowenizeruzomonovuko.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/modiporu.pdf
    • https://cdn.shopify.com/s/files/1/0451/0813/4053/files/sistem_reproduksi_manusia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/turogujevupuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/leraraxi.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/biblia_jerozolimska_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/7014820455.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/46859784542.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/calligraphy_exercises_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/91199815766.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/dotumojevilubokeg.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_off00006b7d.bin
08578bdcaa993871d2eb888e35720d43d82a771f0927e75d9a0be03f34513261
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7D 5284 bytes
font_01_sfnt_off00007d8d.bin
b9a87044e6b981e6edff5cc9370a0eba74705ac980955fba0150f0cc4d930022
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8D 10596 bytes