Malicious PDF — malware analysis report

Static analysis result for SHA-256 803c258f9fc0821e…

MALICIOUS

PDF

36.7 KB Created: 2020-08-04 23:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f50d87cbbc48618c697e6bd8864fd02f SHA-1: 28ecad11e93b17b41e09572932e7cf10afdcf1a0 SHA-256: 803c258f9fc0821ed2ddeb9728bde741f422dde6ec35492eeddc530ecad87e9c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to file conversion and the malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to drive traffic to malicious sites.

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=convert+pdf+file+to+word+2020+online+free
    • http://files.tilliesnevada.com/uploads/1/3/1/3/131379612/xapixivote-pipugu-neruxesivalu-wifuf.pdf
    • http://files.theshavingwoodworkshop.com/uploads/1/3/0/7/130775837/084ade1f8.pdf
    • http://files.leahbiadoluisphotography.com/uploads/1/3/2/3/132302978/wabopiguvol.pdf
    • http://files.nashandcothreads.com/uploads/1/3/1/4/131438180/ferojigorisojebu.pdf
    • http://files.container-conversions-scotland.com/uploads/1/3/1/6/131637147/5930786.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaxigosileworu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5569/files/82922225563.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/21277185892.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/60896463057.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/fiwowujosagejanuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/53853984723.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/capacitive_touch_sensor.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/babovobevemuwatijori.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/22517337880.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/5630410615.pdf
    • https://cdn.shopify.com/s/files/1/0436/7246/9669/files/19191399892.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/sasejetiduwusubabazome.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_off000051dd.bin
aee1b47f0ecbf6b46890f1dc60e6aa51c5b615f91e09965737ee976fec6b0b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51DD 4980 bytes
font_01_sfnt_off000062f9.bin
73b571d31093bf798752e6ba3548de7a8e4a3d54c470fe125d81dea0cd19ae34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 10216 bytes

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