Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7313788b6525297…

MALICIOUS

PDF

43.6 KB Created: 2020-08-23 17:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9d74a7df9fd5b5345d181259a88b12d SHA-1: 97a40c9f4eca7229808ec96c11510152f18d68c8 SHA-256: b7313788b6525297f19f22b6d8c0be47ccca4f6a733d206c4e4a23c4eb56d230
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results and direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=lennox-+gastaut+syndrome+guidelines
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • http://subes.genuinebeautyusa.shop/uploads/1/3/1/4/131437914/bapejejunoj_fosanokemi_bifimelodopun.pdf
    • http://fepadosel.idahohorsecouncil.com/uploads/1/3/1/4/131406709/7691794.pdf
    • http://files.matthewcoatney.com/uploads/1/3/1/4/131407284/sezarufemumomore.pdf
    • http://files.dicarlospizza.com/uploads/1/3/0/7/130775441/1060930.pdf
    • https://cdn.shopify.com/s/files/1/0440/4333/7878/files/lived_crossword_answer.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/figurative_language_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/guide_taille_ceinture_femme_tommy_hilfiger.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/45983301444.pdf
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/capsaicina_externo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/maharashtra_rto_passing_no._list.pdf
    • https://cdn.shopify.com/s/files/1/0435/7006/9662/files/46248243926.pdf
    • https://cdn.shopify.com/s/files/1/0465/0549/2638/files/93762890172.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/9634264439.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/risefanujuxategibosowov.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d0a.bin
207990aebe1d5048457e33b6a50cda0b656d4bc8b28540ddff0f492084b5d54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0A 5288 bytes
font_01_sfnt_off00007f0c.bin
500281138db55cbc7b559d54f69e3db69ec9d66fa262815418248c369d108e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0C 10096 bytes

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