Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1e99f163bfd93a…

MALICIOUS

PDF

42.4 KB Created: 2020-10-27 10:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dccbfc2b4d9ef7eb8394b8712f7eb1f7 SHA-1: e5dc867b61aea7b058b9d058818a79d97c46931a SHA-256: 6d1e99f163bfd93ad952e8882a92a735561bc956c2009f4dc83e4857d985d989
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded links designed to redirect users to a link farm of other PDFs, ultimately leading to a malicious redirector. The primary redirector URL is https://ttraff.club/123?keyword=notice+of+computation+california, which is flagged as malicious. The document body text, though obfuscated, contains keywords related to the lure. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.club/123?keyword=notice+of+computation+california In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1995322.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/sidimefuvusazin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f87eafb64a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_5f9629bac73a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f947bcaa795c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f943d69ad262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f94d1fd3c932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f96e3362733b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f8a868a54bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5f902e3a8b8d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f89c03562c02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/47273768974.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/joveviwum.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/vukurogowiletizuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/beboxigevarigetobo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/wovatejazipuxubex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2799d18-2387-443f-9d67-8e2e05d453d2/yeh_dil_hai_punar_vivah_song_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0cd431-6a9f-4542-aac1-895371c16629/new_castle_airport_car_rental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ca8bab-bb57-49ab-8210-2da5449b9cc9/yamaha_j38_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eb97e7-0910-4aa3-8a87-74790a0b1464/vanaxotejebebagog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251c7591-e0f8-4c75-a6f2-22972d87f0cd/killer_instinct_super_nintendo_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e94abf0-4b78-4b07-bd5f-1f9a4969812e/cara_mendidik_anak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daf6795-f8b2-4b36-ad53-f7d14cf772d1/pleasure_gardens_guide.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_off00006733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 4952 bytes
SHA-256: 03a1c2e3bd9a567292f5b42a622a13966a1291e758a0890e5aee1673c931805c
font_01_sfnt_off000077f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F7 10640 bytes
SHA-256: 72a79eabe908aa0a5ebb85a51edb6291ea9e07ff5c00a7f82eb1a146b69554e0