Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ce8839555c8b97…

MALICIOUS

PDF

37.5 KB Created: 2020-08-05 15:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71090bebc99ee64998a6cfa0d4cb553 SHA-1: a462b7f78c6a154dcbe4533aca7b7b80725ee6e7 SHA-256: 72ce8839555c8b9704d59ff1def8df8f6bf84916cdbf6f861036c89b915a94f0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to direct users to malicious sites, potentially for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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.ru/wb?keyword=earworms%20portuguese%20pdf
    • http://files.intrepidresearch.org/uploads/1/3/2/6/132682070/255424.pdf
    • http://files.kyletheinspirer.com/uploads/1/3/1/4/131406403/a1268db72.pdf
    • http://files.richardwilliamsvideos.com/uploads/1/3/0/8/130873822/5090814.pdf
    • http://files.tinalouisecalidancecostumes.com/uploads/1/3/1/8/131857120/d80e513a68b0.pdf
    • http://files.volunteercentermchenrycounty.org/uploads/1/3/1/4/131455463/vakigolefefiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/adolescent_health_services.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/xalupowobajozewet.pdf
    • https://cdn.shopify.com/s/files/1/0440/7640/0792/files/96152302264.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/mbbs_1st_year_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/20603072453.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/warugedoriso.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/hollywood_movies_telugu_dubbed_free_download_avi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/runeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/sidupemasazasogulu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2865/8848/files/94588011652.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047fe.bin
6afe74c8b2a912de8644c907df8d21ca220b41982e7d9f8b6629f83330202849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47FE 5108 bytes
font_01_sfnt_off00005978.bin
52e2b2a53098386ad903c9f434e378205549fc205136e846c0211d058910964e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5978 9788 bytes
font_02_sfnt_off00007ae9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE9 4324 bytes

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