Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f090fa2c9d5655c…

MALICIOUS

PDF

46.3 KB Created: 2020-08-09 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f882cfab1ae01f935295452c8969bc6f SHA-1: a3eea6bff0e78be2a1ddba6108f5385e7d72fe5e SHA-256: 8f090fa2c9d5655c9514c909b88ecc8fac8a2ef6c5186b32fd6550d83bd9aa6a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a poem explanation. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to 'wkhtmltopdf', suggesting it was generated programmatically to host a link farm. The presence of numerous Shopify-hosted PDF links, many of which are benign, serves to mask the malicious redirector.

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=ode+to+autumn+poem+explanation+pdf
    • http://files.gemflo.com/uploads/1/3/1/4/131406780/xekuzazokunupa_bidibaje_kodex_zeketev.pdf
    • http://files.writerstellall.com/uploads/1/3/1/3/131380511/gidopogisunit.pdf
    • http://files.lolas-ecec.org/uploads/1/3/0/7/130775275/6b08118285f.pdf
    • http://files.aerohydroacoustics.com/uploads/1/3/0/8/130815303/xubipinifujesusesov.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/zevorevasot.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/zekid.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/98640544139.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/ti-_83_plus_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/vobixebozelibes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/75888589902.pdf
    • https://cdn.shopify.com/s/files/1/0432/0064/3236/files/8262687923.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/sidonirugenifuxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2540/6874/files/gunovategunipuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/27630587439.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/41378793595.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jogewavili.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/letter_b_tracing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/vafurufenisuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/gekunaremix.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_off0000785c.bin
54a4ae359cb60ecdd15aa02d6d7906776f6732e58bb0e7c34abecf3bd44fc39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785C 5008 bytes
font_01_sfnt_off0000895f.bin
06fe103bc439e8c344461aac0bdf6839675f62e0f90e02a58e4aef7e62b90f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895F 10176 bytes

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