Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ca1a846e459c0a…

MALICIOUS

PDF

35.5 KB Created: 2020-08-29 19:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c908c0aa8471f343034a670504c6b914 SHA-1: f3e64b643c7b06b6d42ceff532516d8e7e9e98dd SHA-256: c8ca1a846e459c0ac4479c35695b05ba31a9fb61b8c7ed10eecabe7e3d428baa
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, suggests a lure related to educational materials ('Physical science textbook 9th grade'). The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious.

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=physical+science+textbook+9th+grade
    • https://cdn.shopify.com/s/files/1/0439/9346/4990/files/define_inflation_in_economics.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/44635457476.pdf
    • https://cdn.shopify.com/s/files/1/0430/7150/4537/files/jatekofewasijur.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/24753988791.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/konozujuvumadogemozavowir.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dba0c823b7a41fc9f1d03463ff52488.pdf
    • https://static.usrfiles.com/ugd/b8c837_05d5040985d642f49455785083da860d.pdf
    • https://static.usrfiles.com/ugd/b8c837_dff7c2f01dfb49fc867614780af3b1a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e0003f6df384570a96f39d9c6e2e33e.pdf
    • https://static.usrfiles.com/ugd/b8c837_421e14b7ca234560853dc5bebd232cee.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/types_of_telemetry_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9856/files/81512419204.pdf
    • https://cdn.shopify.com/s/files/1/0463/6318/1217/files/25064725261.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/que_es_personal_branding.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/rudoginot.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/rokesovin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4982/0065/files/99659709147.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_off00004ab6.bin
c12fba8e1089ff5059f33834cd18ebd690ebfd592523cae6c811c61cbcfda3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB6 5732 bytes
font_01_sfnt_off00005e23.bin
0918de30768813d6412397424a5823c9772a5c37b3efac5d20fb7021c195313e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E23 10364 bytes

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