Malicious PDF — malware analysis report

Static analysis result for SHA-256 86303dbaf39ee793…

MALICIOUS

PDF

48.4 KB Created: 2020-08-23 18:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d842a7917f7ccdaa040d994d4757fd1 SHA-1: fec449cf6bf2ac7528d1e7217393001db02107a6 SHA-256: 86303dbaf39ee79324287ed742029641b0478cab452930c0758eabf531c06f34
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed for obfuscation and redirection. The document body, though heavily obfuscated, contains text related to 'PPI insurance questionnaire answers' and a URL that aligns with the heuristic findings of a malicious redirector and a link farm. The ML classifier strongly indicates maliciousness, and the presence of links suggests an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=ppi+insurance+questionnaire+answers
    • http://files.kingsventures.com/uploads/1/3/2/6/132696465/duzurodomekefo-foxegapuzesizi.pdf
    • http://gegigejem.offroadandoutdoor.com/uploads/1/3/1/1/131164250/defadedule.pdf
    • http://files.halltosuccess.com/uploads/1/3/1/6/131606756/sikomolesolubo_jisipugeje.pdf
    • http://jopemigi.jordansidfield.com/uploads/1/3/0/8/130874038/jurit.pdf
    • http://xenude.hiawasseeapparel.com/uploads/1/3/1/6/131606069/nedisulumizuvo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/15000286141.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6333/files/98473272391.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/bank_management_system_project_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/51906218884.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/dipizubafede.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/easl_alcoholic_liver_disease_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/jolev.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_off00008089.bin
f7624a2b0f7404514757f07a955516a776564bd83203d5f9adb7db47f9e121f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8089 5112 bytes
font_01_sfnt_off0000920b.bin
b66cfa09be9ef23dc48815d9795e385004f9401215d55139ea5f4fb7b1ada671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920B 10076 bytes

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