Malicious PDF — malware analysis report

Static analysis result for SHA-256 836a9b951fad63ec…

MALICIOUS

PDF

74.5 KB Created: 2020-10-31 04:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8d491613944c6a79c55715aed156d1ee SHA-1: 5a32aeb4eee7124ed8b82e9d37825b2d60418b2c SHA-256: 836a9b951fad63ec25352203fd254f858f20c6f135202019c89176e8f41eaea5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.me/123?keyword=codigo+secreto+de+newbies+on+fire In PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/gakaxut.pdfIn PDF document text
    • https://bivogovaxi.weebly.com/uploads/1/3/4/3/134320375/4004800.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/3562284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f9331e90244d.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/e5a04bffd21a65.pdfIn PDF document text
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/2e2cfcf4.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/1/0504/5213/6117/files/chef_bio_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4515/8564/files/saw_youtubers_game_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1846/7518/files/17934513482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0875/3315/files/vokubani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2602/9976/files/52289577599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25620a4-e2d2-4471-86d8-1f2f13a04c09/macros_in_ffxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4862/1987/files/mobile_computing_rajkamal_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af922b88-f466-47db-923e-f7509955f7f1/shantae_half_genie_hero_trophy_roadmap.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000e63e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE63E 30948 bytes
SHA-256: d505e878e07b15c187f1ac736431684f796c994410f91c5c7ab62544f97c6607
font_00_sfnt_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 5084 bytes
SHA-256: 0364c170620357ef03cfc59c06e9eebb46a0add95c62ba80cc9e681ad0d3cb79
font_01_sfnt_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 11696 bytes
SHA-256: d5bb2ffc2b238e9f054df84511df176aa94db7fdaf61efa1eece8f5f712bed68