Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4624b594c42fba6…

MALICIOUS

PDF

40.8 KB Created: 2020-07-31 08:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d355058362a878cf6132ed9f3d72cb23 SHA-1: e88061f67f2ddb4732663437e77c3f50ffad3e9a SHA-256: c4624b594c42fba62cc7894e3176f3622ced6d1021d2eca61657874d938b7dc9
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is disguised as a search result for a vehicle owner's manual. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO-spam PDFs. The presence of numerous external PDF links, many hosted on cdn.shopify.com, further supports the SEO spam and redirection attack pattern. No scripts were extracted, but the primary malicious activity is the redirection to a harmful URL.

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/wb?keyword=owners%20manual%20for%202009%20mercedes%20c300
    • http://files.vixenpromakeup.com/uploads/1/3/0/7/130739835/xakefiramikegex-dijizan-defelagenafivu-polisakakulede.pdf
    • http://files.vote4georgechen.com/uploads/1/3/1/4/131454255/7309187.pdf
    • http://files.desertofmyeye.com/uploads/1/3/1/0/131070820/kududigonas_susirox.pdf
    • http://files.royal-artstore.com/uploads/1/3/0/8/130874207/suvipiwifelur.pdf
    • http://files.jumpinrealestate.com/uploads/1/3/1/4/131452838/xesakasonibuv_bozuzipa_zudujer_sabuzumixad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44628440260.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/9413436032.pdf
    • https://cdn.shopify.com/s/files/1/0437/2296/5160/files/renow.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/59813688182.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/milojetojego.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/64775816806.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/tewuzupabisirukepif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/wagepipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5490/8071/files/karopefamizevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/62560434810.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/fenibilugefalusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/gofotoperidavuto.pdf
    • https://cdn.shopify.com/s/files/1/0436/0205/1229/files/42774752527.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/jelutonifimofuwiteruja.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/
    • https://cdn.shopify.com/s/files/1/0430/161

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000573e.bin
b0a2d3529a9206b6f43b515ae6850e8b1b97385deb49bb5de03afd7eb7a50193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573E 5636 bytes
font_01_sfnt_off00006a4b.bin
047d9842dbd2afb569f9d32e27723bc7aecd2debe74600ea1be6f94d6cc14a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4B 13132 bytes

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