Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f87ca4d59a2fca0…

MALICIOUS

PDF

44.8 KB Created: 2020-07-27 19:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268a33875bc6ec44c6b4e88ebb958116 SHA-1: 5f5f4147989414e2909eb521f61e6f2dcef1cbea SHA-256: 0f87ca4d59a2fca0459c1e5e2fd90d55ce514366ec9bcfed8fd13bec87c84845
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly indicated maliciousness. The document's content appears to be a disguised worksheet, likely intended to trick users into clicking malicious links.

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.ru/pify?keyword=dihybrid+cross+worksheet+pdf
    • http://files.nyapsa.org/uploads/1/3/1/3/131383548/mozegiputiritala.pdf
    • http://files.hawkecreations.online/uploads/1/3/2/6/132682929/fukezusapuv_kudex.pdf
    • http://files.1ccauburn.org/uploads/1/3/1/4/131406435/vusidupawe.pdf
    • http://files.williamsauctionservice.net/uploads/1/3/1/4/131454304/tonaxirezuwozedenile.pdf
    • http://files.marketmenz.co.nz/uploads/1/3/1/4/131409621/1434775.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/53393434382.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/66352077487.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/melunovufevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/2439524309.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/gomiwuwisalida.pdf
    • https://cdn.shopify.com/s/files/1/0430/6485/2634/files/lisanuvidajerifarebek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/dusevezakutupudozugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/34302045564.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/51745876328.pdf
    • https://cdn.shopify.com/s/files/1/0434/2074/5893/files/todebugopupofesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/32694841711.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/67032285984.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_off0000724c.bin
cb1dd84c6ac41dd68d000df3747a81e1a84a2b20b830c3ae18d9defe7ab76d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724C 5080 bytes
font_01_sfnt_off000083ba.bin
3cd068a881405a2d84d0ca2905dfa39d37664b6689b0c0a8e7122c2dbe735796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BA 10060 bytes

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