Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f5abd72d144f4d…

MALICIOUS

PDF

40.3 KB Created: 2020-08-21 00:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf63d6f21779d840f2bcb41793070b83 SHA-1: e66f6576b026b07f3b42cae75d18d0adba5e63c1 SHA-256: 85f5abd72d144f4d69d1589153a138c11fed6518358dd8395158023bc368f5c8
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also exhibits characteristics of a link farm, with numerous external PDF links, as flagged by PDF_SEO_LINK_FARM. The SE_MFA_LURE and SE_PASSWORD_ARCHIVE_LURE heuristics suggest the ultimate goal is likely credential harvesting or tricking the user into downloading a further payload. The ML classifier also strongly indicated maliciousness.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=rmit+enrolment+guide
    • http://files.jhva.co.uk/uploads/1/3/1/6/131636814/d33d58cdd837cba.pdf
    • http://sikobab.cvhelper.org/uploads/1/3/2/7/132741555/8149345.pdf
    • http://files.seizetheribbon.com/uploads/1/3/0/7/130739470/770c372a28a27.pdf
    • http://files.vibrantlifestudio.com/uploads/1/3/2/8/132814272/f12549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/98804830336.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/subabikoxiloletiboni.pdf
    • https://cdn.shopify.com/s/files/1/0434/1507/7022/files/blended_learning_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/medivitedizuketanaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/zewovudibimijumusol.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8695/files/lakoniwubakeseniwamesas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/st_louis_cardinals_injury_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/pilijovizer.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/50502018958.pdf
    • https://cdn.shopify.com/s/files/1/0437/1434/7160/files/australian_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0434/0187/1512/files/python_dictionary_append.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_off00006159.bin
cdc2dafdd9829d71436b667baa2747a40613a1175337254c57fa32f770d5049a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 4764 bytes
font_01_sfnt_off00007175.bin
f9975d960a31ef373190968b7c2cf7c5fa03a2023d66200368c3a51762998d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 10244 bytes

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