Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7b1e046e8d92bf…

MALICIOUS

PDF

47.4 KB Created: 2020-08-21 08:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0478e626324b2ef48e1b5f9034bca85 SHA-1: bd2a1e681a3d885c2b561a8e4f937ff07f169cdb SHA-256: 1f7b1e046e8d92bf906f99c529b293b4e4ebd67be16a3423ab59d7facc20bcf8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised with keywords related to mobile anti-malware. It also hosts a large number of other PDF files on Shopify domains, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier strongly indicates maliciousness, and the overall structure points to 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.ru/pify?keyword=best+mobile+anti+malware+for+android
    • http://files.wcbk.com/uploads/1/3/0/7/130776726/4433218.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/10045903072.pdf
    • https://cdn.shopify.com/s/files/1/0429/1375/9395/files/7908658145.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/jomositudab.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/kawevulumegodajurudizob.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/vesagilugifumubixuzejew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2922/files/28671672040.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/bichoo_full_movie_480p.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/accounting_concepts_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/zafixunuko.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b48.bin
e1daaa75e1618beb11efc130042255583ba300070073443137f55e41590392e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B48 5332 bytes
font_01_sfnt_off00008d59.bin
af4982e87478a883df85ddb06c3afad78c72df40b59505c5f67b3d1aea8eee82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D59 10420 bytes

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