Malicious PDF — malware analysis report

Static analysis result for SHA-256 96deb61ac66a9319…

MALICIOUS

PDF

46.6 KB Created: 2020-08-25 01:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a1c19a07d90a07ac76d7488e78a9dff SHA-1: 32469678429cc82b3df0e3da5ebc777bab09c6e6 SHA-256: 96deb61ac66a931982c51291913baca641b288960c370abeee612cd1126286ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=bibtex+file+format', indicating a likely attempt to redirect users to malicious content. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic.

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=bibtex+file+format In PDF document text
    • http://files.mikearcherphotography.com/uploads/1/3/1/3/131398113/3835d.pdfIn PDF document text
    • http://files.thomastownns.com/uploads/1/3/1/6/131606605/1041419.pdfIn PDF document text
    • http://vapigupi.saintgregorysileby.org/uploads/1/3/1/3/131380934/kotebogisarisaf-folijoma-rojugizaj.pdfIn PDF document text
    • http://jipitilat.sethgangwer.com/uploads/1/3/2/8/132814930/nanalurefatakirivu.pdfIn PDF document text
    • http://files.ctslouisstlaurent.com/uploads/1/3/1/4/131438604/9660862.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/1/0429/8909/3018/files/81206923431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/60438183983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5652/1631/files/99680329310.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/ancient_civilizations_of_the_world.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/bpsc_38th_bcs_admit_card.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/rolulakesifoxar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/viwataroge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1688/0029/files/android_mod_games_new.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8497/0152/files/tulunise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0586/9217/files/hd_video_recorder_manual_ball_point_pen.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_off000078ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78EF 4992 bytes
SHA-256: be6b34bea9d4c502e4acc93ae25fb011314141615707ac9da463726638eced4e
font_01_sfnt_off000089d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D5 10504 bytes
SHA-256: 3bdd4f501cfc57a9f0aa9442c7173bc159d358b2c30c86c9f6cf3f2d23d81d62

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