Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcb61161a1d9138…

MALICIOUS

PDF

38.7 KB Created: 2020-08-01 11:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cbfa35b51369fbe084f5f39c0af63c8 SHA-1: fbb6f3bdc6ac37200e667468084b6b039cc8da6d SHA-256: 0dcb61161a1d91387c8b0bcf0cba31fda9420fa2371a95715c75b4a1b1302216
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary redirector URL identified is https://ttraff.com/pify?keyword=yo+tambien+in+english. While no scripts were directly extracted, the structure suggests an attempt to leverage the PDF format for link-based redirection, likely as part of a phishing or scam campaign.

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=yo+tambien+in+english
    • http://files.leechlakeassociation.com/uploads/1/3/0/7/130739328/18f5eed4.pdf
    • http://files.opunakesurflifesaving.com/uploads/1/3/0/8/130814513/gezitowejukejekojuko.pdf
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • http://files.thefifacorruptionscandal.com/uploads/1/3/1/8/131872087/46810.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/gubodupugugezuzori.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/69003336030.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/91964090864.pdf
    • https://cdn.shopify.com/s/files/1/0436/0306/7044/files/suxedubalav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2128194791.pdf
    • https://cdn.shopify.com/s/files/1/0436/6116/4697/files/swords_and_sandals_3_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/lisuxebesuruzekilag.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/getanevajukitexapi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3408/files/najugiravaripap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/29297078116.pdf
    • https://cdn.shopify.com/s/files/1/0428/4284/9446/files/68995218522.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/44009461468.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/jazopevasilepesosut.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/77333469261.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_off00005832.bin
1966cf0291bb617c7143f4f07fccf783e73aac7881d2fd113b88508000e8f984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5832 5104 bytes
font_01_sfnt_off0000696c.bin
beb74f9428923411363680d770fda41792ea3010edd2dbf3cdad1953cca778dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696C 10772 bytes

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