Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c47d44b376133c0…

MALICIOUS

PDF

42.2 KB Created: 2020-09-21 01:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 733b4b57d8ad213b7dba5ade1d2cf641 SHA-1: 4de18c3274eaa1c3a401fe359e510233805e5f47 SHA-256: 6c47d44b376133c0bd652bb0ce5a005c56e23c239973d2b31bd5f9f28c8db11a
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a common tactic for SEO link farms and phishing. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=subway+surfers+unlimited+coins+and+keys+apk+kickass+download+hack', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to malicious or unwanted 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.ru/wix?keyword=subway+surfers+unlimited+coins+and+keys+apk+kickass+download+hack
    • http://kexeba.ajspinksfilmmaker.com/uploads/1/3/0/7/130739663/2060758.pdf
    • http://files.blissofne.com/uploads/1/3/1/4/131437005/36dbb8138a4.pdf
    • http://kiwegu.jacquelinejanas.com/uploads/1/3/0/8/130813528/e33c1.pdf
    • http://files.aroundthepros.com/uploads/1/3/1/4/131454733/a491eef9a0b02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5a364793-5cfc-46b8-b862-0b897ca70eb7.filesusr.com/ugd/253000_58484d372d9b4f6a99bd7a4efc58c7c8.pdf?index=true
    • https://b5e9479a-0a6b-4cf2-8581-2ecca80c2c1a.filesusr.com/ugd/d7ba0f_a788cc1e9d7f451ab874e6a13b7950c1.pdf?index=true
    • https://b9edefcc-da3e-4c60-af20-aab204bab171.filesusr.com/ugd/21e6f2_d2cb68d524d34a5ca618e0c5010905cc.pdf?index=true
    • https://d8724b2c-6c77-4108-bbf5-a1828b78ba6e.filesusr.com/ugd/409ca8_c257f23713df4cf68161e74438ad608d.pdf?index=true
    • https://d6c0e543-6755-4178-bff8-1e92d40f51c9.filesusr.com/ugd/65e777_e9ac558b36234a5387ec7f947b1ec986.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/8062/0955/files/airships_conquer_the_skies_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/7292/8409/files/4752857413.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/gupukusujapilitomebal.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_off000062eb.bin
f90ba5924d149e54168b34658f081d1bd4c471a4b0030318e8bed4af44ce9378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 5896 bytes
font_01_sfnt_off000076e4.bin
63e93ce2a0ae75f92094fc6d6a371834fd879242386eaf3cd07d0819bc0972b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E4 10640 bytes

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