Malicious PDF — malware analysis report

Static analysis result for SHA-256 f546ecc82d111a04…

MALICIOUS

PDF

41.4 KB Created: 2020-08-05 15:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f91a0df6e0eb06f387177061390df9d4 SHA-1: ae6a5c8a8a45c0d3f9aa794ff9658e80ba1aca31 SHA-256: f546ecc82d111a04568dc27e191a1d210fa0f7e244ec5b4a32774d6eb5aa4e4b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body and embedded links suggest a lure related to document translation, directing users to the malicious URL https://ttraff.cc/pify?keyword=traduction+document+pdf+anglais+francais+gratuit+en+ligne. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious 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.cc/pify?keyword=traduction+document+pdf+anglais+francais+gratuit+en+ligne
    • http://files.arnhemfallenangels.nl/uploads/1/3/1/6/131636719/4222789.pdf
    • http://resex.thegreengecko.co.nz/uploads/1/3/0/7/130739777/wivifo-tadefor-zidaki-fuwej.pdf
    • http://files.flyingcoloursmusic.co.nz/uploads/1/3/1/1/131163578/tatagosedub-wepetaji.pdf
    • http://files.wabauer.com/uploads/1/3/1/4/131406741/wotiz_lebibatuvumud_zozoni_tirip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8955/8680/files/xuruno.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/todokotetokanabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/82954365583.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/zamisukodivodowegu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/xejesujetarod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/76249018960.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/zulevebavoretevopokebofum.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/77260053057.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/weroxujowawejenoporuligo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/definition_of_intrinsic_and_extrinsic_motivation.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/sagore.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_off00005fd1.bin
5deca40d89a0d1200cbdea7a35cd8f2e12eee11c9ce2baecc43a4ce9c2253115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD1 5424 bytes
font_01_sfnt_off00007230.bin
f7523e5e28d71e5f78f45479c56fbaa4da35addf1ec3c5226931300d336a7f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7230 11544 bytes

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