Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d9db3605ca4853…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 03:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3f21fc6afcbfce0e855fed905fabe64 SHA-1: 54fa850f14c1a4f9c1ebf60ac20dea423b14d8fb SHA-256: 08d9db3605ca4853bb88c980272d4fd2a9bf0a28381d3d63c9003d9f9d093fe1
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate academic resources, but the primary link redirects to known malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to disguise malicious links within a large number of seemingly benign ones. No scripts were extracted, but the embedded link functionality is sufficient to classify this as a malicious redirector.

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/wix?keyword=fundamentals+of+fluid+mechanics+7th+edition+solution+manual+pdf
    • https://digitalcontentmarket.org/wp-content/uploads/2017/12/Fundamentals-of-Fluid-Mechanics-7th-edit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/dojubudox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/kidifafivupiperifofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/96041688905.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/43212741042.pdf
    • https://cdn.shopify.com/s/files/1/0435/1269/2895/files/tedixenavakomuvowavax.pdf
    • https://static.usrfiles.com/ugd/362633_8a8cc88d5212499385170e521fee6dea.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf171a5ef2d744f5b6df74b9ed201237.pdf
    • https://static.usrfiles.com/ugd/93c935_2bffb53aa614430aa302aa4ed8571510.pdf
    • https://static.usrfiles.com/ugd/06497e_cb9fcd793b0447ebab0244bb86e6512c.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1285/files/learn_french_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mokotutirajozejimus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/slope_intercept_form_to_standard_form_steps.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/kelitopezeloz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/71181874750.pdf
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/nimisewepivozibuzuju.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_off00005e57.bin
37765f0427ee3ec5d911267467c9b6e19ba06c0bedca1371df2c1eb15b0eb0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E57 5336 bytes
font_01_sfnt_off00007063.bin
e6c99b77120d12a57e790d8a9133aff39906778b0fddd69571509026aa25d843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7063 10156 bytes

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