Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a119f7ed9074eeb…

MALICIOUS

PDF

35.0 KB Created: 2020-08-19 05:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaa67bfb5f8e4a198e714b588eb498ec SHA-1: 2333a60783886c7f727db8107b9cb54c2c446bf5 SHA-256: 6a119f7ed9074eebc58b9908519fa0b3bb7bd8128bfc322ceadf2c9802e71c0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent link, 'https://ttraff.cc/pify?keyword=more+than+less+than+worksheets+kindergarten', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious infrastructure.

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.cc/pify?keyword=more+than+less+than+worksheets+kindergarten
    • http://powatik.justintylerowens.com/uploads/1/3/1/8/131857252/gopuxi-dabikoxoka-kawidesitamilo.pdf
    • http://files.sevenspringslake.com/uploads/1/3/1/8/131856108/mipozasinupazelu.pdf
    • http://files.rothe-photography.com/uploads/1/3/0/7/130740211/gexopolitexu-nabel-warawuwo.pdf
    • http://tiruzepo.concretejunglefarms.com.au/uploads/1/3/1/4/131437919/dcdac9f33c28d48.pdf
    • http://files.mthschoirs.org/uploads/1/3/0/7/130739696/sarumeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/25680682912.pdf
    • https://cdn.shopify.com/s/files/1/0450/3309/5326/files/furejevonotowikox.pdf
    • https://cdn.shopify.com/s/files/1/0430/6848/9881/files/kiran_bank_maths_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/0476/2011/files/nulimireseresovebiveser.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/50494233476.pdf
    • https://cdn.shopify.com/s/files/1/0434/6501/5446/files/95734270840.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/59821907826.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/kumpulan_jurnal_akuntansi_internasional.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/3579310487.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/mufoseterekabojovibubovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/jurififisarizivake.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/sociological_definition_of_family.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/categorical_data_analysis_book.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c63.bin
c57ba54cb6da7ac6d057efbbb00bbc1f24dec44af9562702fd6f191b24d50d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C63 5248 bytes
font_01_sfnt_off00005e46.bin
adcfb79be3d2519f6925db76bb33201ba4f72a8b85d6c9efd89911d8dd0d0a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E46 9532 bytes

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