Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8bb104cc13cae5…

MALICIOUS

PDF

45.9 KB Created: 2020-08-02 10:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4970a514cb6fdac3ff990d6a5563bd9b SHA-1: c9c5dfd6897b885c15fa456080fb5f0c1f132894 SHA-256: 0f8bb104cc13cae542f1f44340f8e1642658c793bcc279386b3fceacc0188c11
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a game ('Grandma cookie clicker'). The PDF also contains a large number of external links, suggesting it is part of a link farm. No scripts were extracted, but the presence of malicious links indicates a phishing or redirection attempt.

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/pify?keyword=grandma+cookie+clicker
    • http://files.utourdoc.com/uploads/1/3/1/0/131070476/venixusis.pdf
    • http://files.firstireton.com/uploads/1/3/1/1/131163738/jitubivev.pdf
    • http://files.photosandburritos.com/uploads/1/3/1/4/131406843/nezumuwugarel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/3183/6310/files/euphony_literary_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/fizokufipapefegifodub.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/92647520812.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/rixuruw.pdf
    • https://cdn.shopify.com/s/files/1/0438/1124/2144/files/zagojegijexejojepajuva.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/fumibatinazug.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/87671169271.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4328/files/gasidebixunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/38066904742.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/xogilaritanet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/80658895724.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006962.bin
f4c8b3d6a665b52055c58a2dbdd229fe265fa781f86d8f103d6468379bb17bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6962 4712 bytes
font_01_sfnt_off00007938.bin
3aecadf2fa8b661ba7b61133fde3634dd83bb9c4349d2f9e9570b9f55bbd17a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7938 10540 bytes
font_02_sfnt_off00009d31.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D31 4324 bytes

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