Malicious PDF — malware analysis report

Static analysis result for SHA-256 861f3785cd240c42…

MALICIOUS

PDF

39.2 KB Created: 2020-08-06 02:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e171431fa15fcc1776eb4570b8bf0584 SHA-1: 632cd1f6b11e74b7a3ad068d2c1b155e51301a28 SHA-256: 861f3785cd240c423110bd7b54ff0fc15b30d8d6002e3be73d2f35058b2c2930
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are to PDF files hosted on various domains. The primary malicious URL identified is https://ttraff.cc/pify?keyword=cancer+gastrico+temprano+pdf, which is likely used to redirect users to further malicious content. The document body itself contains metadata and a truncated version of the malicious URL, suggesting a lure related to 'cancer gastrico temprano'.

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=cancer+gastrico+temprano+pdf
    • http://lofojo.anndesignstudio.com/uploads/1/3/2/3/132303382/kojoxemoj_penufiromaretaf_tititegolunefip.pdf
    • http://files.furrygodmothermb.com/uploads/1/3/0/7/130776267/mezosajigera.pdf
    • http://files.stuart.boundlessgym.com/uploads/1/3/1/4/131409574/zutegivo_girabuneviz.pdf
    • http://luwixabed.hernfarms.com/uploads/1/3/0/7/130776031/5a042f9ee38cef0.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8318/files/gumovugojiperi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/begokokivarevugemuwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/2000_isuzu_rodeo_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/55762578345.pdf
    • https://cdn.shopify.com/s/files/1/0433/8371/8042/files/75427390063.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3152/files/xazilazixaxededi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/28447042837.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/kutewabulosukat.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/all_calculus_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/58507258082.pdf
    • https://cdn.shopify.com/s/files/1/0436/4068/4697/files/54730477050.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7303/files/premiere_pro_alternative.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/dlab_practice_test_free.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_off00005be2.bin
833e95137b3171b80359977f0db8176111c00a60171865c6b789c316e387efba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE2 5348 bytes
font_01_sfnt_off00006df9.bin
a0b4b708708675e11bd0853260973561f112efb4d0afd507099837714c76ad5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 9980 bytes

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