Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a94bfce8cc445d4…

MALICIOUS

PDF

120.8 KB Created: 2020-08-06 08:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80c9516762dbe65c1be68179e96941a5 SHA-1: 4d699f4580223405f66ea6623a9a2dec8df8ef1d SHA-256: 6a94bfce8cc445d4d12c893201d49babdeffc2c9b4f23282653f29d3f38d05ec
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to trick users into clicking it for a fake PDF download, likely leading to a phishing site or malware.

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.com/pify?keyword=livro+genetica+thompson+pdf
    • http://files.eighttreasuresyoga.com/uploads/1/3/2/3/132303001/4876700.pdf
    • http://files.caricaturedcvamd.com/uploads/1/3/0/8/130814340/8d2393a.pdf
    • http://bunovura.earomi.com/uploads/1/3/1/4/131407241/8393224.pdf
    • http://files.rebeccaocainlaw.com/uploads/1/3/1/6/131606552/migisukijobal-bakuwidodopu.pdf
    • http://vixope.stressfreesettlements.com/uploads/1/3/1/4/131408100/nekizimezewiduf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/fidapadafelopekizufaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/60749793100.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/toby_tab_manager.pdf
    • https://cdn.shopify.com/s/files/1/0431/7626/3841/files/37989600263.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8727/files/814199537.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/biography_of_lord_krishna.pdf
    • https://cdn.shopify.com/s/files/1/0432/7007/8617/files/fovokapidapexubira.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/livimuwedodekusesoxej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/dakipegalukakafajetagemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/80182324038.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/fodugipadisupupafif.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_off00019137.bin
39745bceaccc7b8dc99c44ee7bfcb7773c7d7be34c8f7de7dbb5d38c823e3a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x19137 5536 bytes
font_01_sfnt_off0001a3f2.bin
2e0a8bca121ce79add29b3b0a96727b6327df97c787b912fbf634b7d5c9c2057
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F2 15036 bytes