Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a2c8e957059d5b…

MALICIOUS

PDF

55.0 KB Created: 2020-08-05 00:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceed9f24f713dcc5e1f24bb59ddc5aec SHA-1: a21646112d30d0b2f8a30357af19f348175030cf SHA-256: a3a2c8e957059d5beb6562fca4d8926facc436e8b5a80145fb831068a917cccb
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=algebra+2+regents+review+pdf
    • http://files.komallad.com/uploads/1/3/0/7/130776016/mepurokolusi_tuvipikafu.pdf
    • http://files.pridefightingchampionshipstribute.com/uploads/1/3/0/8/130814235/f67774d2690a.pdf
    • http://files.raggedmountainrunning.com/uploads/1/3/1/0/131070098/4796002.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3082/files/warhammer_40k_orks_8th_edition_codex.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/senate_report_93-_549.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/judigekobozefokafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/71558367326.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/771356085.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/11321985502.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/ruveworosanufunikobit.pdf
    • https://cdn.shopify.com/s/files/1/0435/9415/4146/files/zuxafup.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/namipom.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/99871866259.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/cfa_institute_industry_guides_the_asset_management_industry.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/tibipezawoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9500/7137/files/44635470405.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_off00008dfe.bin
2637e1d90199f445b091d98018e96a714fcd153e505c782c957b1674d8d7ef8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFE 5624 bytes
font_01_sfnt_off0000a141.bin
40a9f2db8ad022e64308126a2a6d0c1a05ceb1ad3f2682f91e81b4aab1dfeb63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA141 14644 bytes

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