Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbbc84e8090e2e6…

MALICIOUS

PDF

48.6 KB Created: 2020-08-24 23:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5451a538bc33f9f7e13d7b90357a57b2 SHA-1: dc5b12adbeede9c47df99560b700acaa23d076ce SHA-256: 0cbbc84e8090e2e664dc62a0c9acbee9f78231d066f2e4238c3736ed9377db88
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or phishing lure. The document body, though obfuscated, contains URLs that are likely intended to lead the user to malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful sites.

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=arrays+in+c+programming+example+programs+pdf
    • http://files.northernbugwear.ca/uploads/1/3/2/6/132681294/a1afb5ddb814e.pdf
    • http://pavupima.ivnmarketing.com/uploads/1/3/1/4/131437079/f05871117bce.pdf
    • http://rovujo.mysje.org/uploads/1/3/2/7/132740267/biguwokep.pdf
    • http://nukos.hartfordfederated.org/uploads/1/3/0/8/130814328/8873702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/6325/0839/files/barron_s_6_act_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/73898118906.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2382/files/sisatunurupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/jekotijuguzijuputoditop.pdf
    • https://cdn.shopify.com/s/files/1/0452/4258/1153/files/driver_application_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/flyff_blade_equipment_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/67159962052.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/raxipasunex.pdf
    • https://cdn.shopify.com/s/files/1/0444/5811/5239/files/action_essentials_2_full.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_off0000712e.bin
60bf130bee8a0754fde9036415e07b0482b8f30db9d741978aa0f5ef488782ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x712E 5636 bytes
font_01_sfnt_off00008447.bin
ff94287228dc011d2809bf67bdf4dc0297ae2306214f373d6047b613563ba5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8447 15792 bytes