Malicious PDF — malware analysis report

Static analysis result for SHA-256 f704e2e83d83c7af…

MALICIOUS

PDF

45.0 KB Created: 2020-08-06 09:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ecdcaa2d797dd42f5ae98ef2f411944 SHA-1: 12d4afcadde2896fe2707c3d19f04420aea7ae82 SHA-256: f704e2e83d83c7af6965721bf75aff506eb65c2054d7c557b685757cd907d68e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=risk+assessment+sheet+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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/pify?keyword=risk+assessment+sheet+pdf
    • http://files.finding-solace.com/uploads/1/3/0/8/130813526/da7fa66bf7994.pdf
    • http://files.addeumsubdivision.com/uploads/1/3/1/1/131164386/c5a47959b86e.pdf
    • http://judex.mathiascompanies.com/uploads/1/3/0/8/130813765/d19fe53c5fe346e.pdf
    • http://files.rmlandscape2.com/uploads/1/3/0/9/130969075/zezivomixi.pdf
    • http://files.scholasticgrads.com/uploads/1/3/1/3/131384136/8191077.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/biology_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/turuvixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/rita_pmp_exam_prep_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/84710879144.pdf
    • https://cdn.shopify.com/s/files/1/0438/2693/8018/files/zokodatav.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/21862592559.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/2842673450.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/godolepasudobebaba.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3157/files/mejoxodit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/83095974355.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/49450619142.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0163/files/sql_try_catch.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/xulab.pdf
    • https://cdn.shopify.com/s/files/1/0438/6632/5157/files/42671371576.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/xesuvoguzuwaxiso.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_off0000723d.bin
9a43f4af887185a8164cf8321cd418c0764601f384e8c7500b9e77c1ff187222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723D 5224 bytes
font_01_sfnt_off000083ea.bin
77dab772a49991596f3683b00a08d05d8f24f726431cc5353857577bdbb0844e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 10288 bytes

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