Malicious PDF — malware analysis report

Static analysis result for SHA-256 db77576e3d49ca71…

MALICIOUS

PDF

64.3 KB Created: 2020-08-30 20:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf29d12d3f6bf8d46919fe6f4822bc7c SHA-1: e37bcf16c3488dc8d40a5a869de87edcde1d22a2 SHA-256: db77576e3d49ca71642fd96f5e8d95a3432ba38375d91afc4677011bd68f6bfa
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also features a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword parameter.

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/wix?keyword=mariagna+prats+e+luis+miguel
    • https://cdn.shopify.com/s/files/1/0437/0379/5865/files/38726619723.pdf
    • https://cdn.shopify.com/s/files/1/0449/4727/5931/files/1-_99_magc_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/sakuzodit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/44521893112.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/53077246483.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9a42f47445e48849989b37a702e4ada.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/dulupezoradot.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/12745949693.pdf
    • https://cdn.shopify.com/s/files/1/0439/8471/5934/files/jorge_baradit_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/password_keychain_mac.pdf
    • https://cdn.shopify.com/s/files/1/0459/6082/2943/files/17092148023.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/narezodususududeb.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_off0000b389.bin
04c58a249eb7963eb16621fa18d74d27c83db926117f87c56454e98afb5adbde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 5144 bytes
font_01_sfnt_off0000c4f3.bin
b0d1d443cee9cbd029113c6c74fd4e13de834117eeb0adf8875e25344da93c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 15200 bytes

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