Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7099030b73c9ab…

MALICIOUS

PDF

51.1 KB Created: 2020-07-15 01:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6be2f10389e20153958d8d1fa3da42f3 SHA-1: ca1a69261a8e74e56e3f37f2307419b0d241030b SHA-256: 0c7099030b73c9ab4f9b49f4e402d6c5a602c410b094816e286b4d1c166f8b1d
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure. The presence of numerous PDF links, many hosted on Shopify, points towards a link farm or SEO manipulation tactic to distribute malicious content.

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/wb?keyword=decreto%20sicurezza%20bis%20testo%20approvato%20pdf
    • http://files.monicanoemiphotography.com/uploads/1/3/0/7/130739174/2131744.pdf
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • http://files.autochekcenters.com/uploads/1/3/1/4/131406966/9591634.pdf
    • http://files.kristinelidrissi.com/uploads/1/3/2/7/132710748/afba9ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libuzab.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/92391662241.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/15563591572.pdf
    • https://vavimanuda.files.wordpress.com/2020/06/84360669312.pdf
    • https://jumalorapof.files.wordpress.com/2020/06/salikifi.pdf
    • https://xivatuzivo.files.wordpress.com/2020/06/29044245152.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/11887782365.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/81297172326.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/bipemineg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/losexofiwaxowazozafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0831/8878/files/vapusiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/koresoxabupozanajagojine.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/41440986785.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/48257507469.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_off000085bd.bin
b3069f27aa91599d769231bea3ea602709b7fe2460a25a143510acaa2216d455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 5144 bytes
font_01_sfnt_off0000975c.bin
abb1c831c8733c7f6d1e01dbbc561d86a8b04ccbcc3f91887bf7f6aa740b2810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x975C 11588 bytes

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