Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a6afe0f5761e71…

MALICIOUS

PDF

33.0 KB Created: 2020-08-13 00:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a647fbc65a6e382c9995221afb0b65 SHA-1: c57cc29f73ed17821cca55ebe88e64d21d2ea4dc SHA-256: 10a6afe0f5761e71145460c83dce92007aa59f74dad866de9b9dfaa7524a8d85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. The primary redirector URL is identified as malicious. This suggests the document is part of a phishing or content-scraping scheme to drive traffic to attacker-controlled sites.

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=flight+stability+and+automatic+control+robert+nelson+pdf
    • http://gunat.gracechristianvisalia.org/uploads/1/3/0/8/130813042/2709218.pdf
    • http://files.mrssimslit.com/uploads/1/3/1/4/131408928/selofutekamasum-dupewebotunako.pdf
    • http://zemal.pengybrooksilkenwindhounds.com/uploads/1/3/1/3/131379312/44db8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/42624758850.pdf
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/applied_ballistics_for_long_range_shooting.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/rezawaveko.pdf
    • https://cdn.shopify.com/s/files/1/0435/9795/5229/files/83774664045.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/tugipotosofakefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/mirebezefovuwawi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/employee_provident_fund_act_1952.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/dajutazawitiwigijafomifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/3844617371.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/49788392821.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043ab.bin
cf8590d68bdc43c306e1cc1fda5faf390ddb0525ae128cba08e4ad251716275e
pdf-font-stream PDF embedded font (sfnt) at offset 0x43AB 5764 bytes
font_01_sfnt_off00005718.bin
7ea8a88a5ba5d10053451e6e44b1be1e73bffd121b86c06d328cf253ce9c1b4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5718 9288 bytes