Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f2c8cb0f13d343…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 00:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53234ea680d9e24bf46fd3cd4ee89d14 SHA-1: bb8e39cdaf739063312e11633722cc74e9447c84 SHA-256: 79f2c8cb0f13d3438c6b97fd6a1eb9b83d653cfbcd62bd224160437d4350ac5c
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. The primary link directs users to a malicious redirector, likely to facilitate further malicious activity. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a phishing or content-farming attack pattern.

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.com/pify?keyword=cognitive+behavioral+therapy+manual+pdf
    • http://rogabare.adamscounty5kchallenge.com/uploads/1/3/2/6/132682883/155ddfc8821.pdf
    • http://zemuzula.scsaints.com/uploads/1/3/1/3/131383790/5598655.pdf
    • http://files.unostradivariperlagente.com/uploads/1/3/2/7/132740997/1275996.pdf
    • http://xagef.epicrobotics.co.uk/uploads/1/3/2/7/132740405/joporenixekuporuriba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/xegaxepevajubus.pdf
    • https://cdn.shopify.com/s/files/1/0436/0496/7581/files/44832465946.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/gevalizorasowamaposakirum.pdf
    • https://cdn.shopify.com/s/files/1/0431/9966/0194/files/81637944180.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/noxotowezitipogaruz.pdf
    • https://cdn.shopify.com/s/files/1/0444/6945/2967/files/internal_auditing_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/physics_for_scientists_and_engineers_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/28564602158.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/serosikilanaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4583/files/43864736022.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/pegojokivimamisetoper.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/balateje.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/rutoroburerusizig.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/zoramepolebijemut.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_off00006885.bin
c4f98665b7b9e2579172924fd3d00bc583d97c594424e1a98e73a8e8b41bc8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6885 5484 bytes
font_01_sfnt_off00007b0d.bin
5afde98db28871d9189be3e0f06519e3ee14c92f7a07a46e5d2ffeed55a1ef60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0D 10476 bytes

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