Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e761fcaccdd67f…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 12:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d85ec106b6cd599cd594df17b8cbebdb SHA-1: 2a29a8c49a2d6e5b4180b2a3bf1d04ce0aeaaca4 SHA-256: b0e761fcaccdd67f1b299639986f8ee56e849b3927f873ca792ce34a3f0e5392
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a resource for learning Arabic. The document body and embedded link structure suggest a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF contains numerous links to external resources, many hosted on Shopify, which is characteristic of SEO link farm abuse to mask malicious redirects.

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=apprendre+%25C3%25A0+lire+l+arabe+rapidement+pdf
    • http://files.blissdough.org/uploads/1/3/1/1/131164039/16b007cfc9658e9.pdf
    • http://files.danielledesnoyersphotography.com/uploads/1/3/2/6/132681670/8531411.pdf
    • http://files.mooserange.com/uploads/1/3/1/4/131438423/voxoxeweje-kexif-keremamor.pdf
    • http://files.tim03jr.com/uploads/1/3/2/6/132681976/3235022e8fd719.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/soxelasado.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/vopedojodaven.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/bafepajadutotowot.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2426/files/55912144505.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/labuvazeranun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0758/2106/files/21426155294.pdf
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/rekadudaxem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/felijixiloganuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/bozevudidaredogeteveve.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/wazinanarudifikage.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/laboratory_equipment_quiz.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_off000060df.bin
e4cc471424f703975fb6bdb9e1d82c65855a7ca0623f2bc27ded3798e02d5845
pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 5372 bytes
font_01_sfnt_off0000727e.bin
06f40bd84ecfb150615de187b314b3e1d565dbfd5752f13fbc077d8d8733940c
pdf-font-stream PDF embedded font (sfnt) at offset 0x727E 11756 bytes