Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85d1cd5a3ab9c2d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 01:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 329c0c2c99efe9169f8bccef3e218b1a SHA-1: 15c992319a1abb0fa737f529a084b06439bce20f SHA-256: f85d1cd5a3ab9c2d699f941b83bef942ecb34553debde736a063f7c331323583
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to movie audio songs. The PDF also contains a mass external PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness.

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=kgf+movie+audio+songs++naa+songs
    • http://files.ldamontessorimaterials.com/uploads/1/3/1/6/131636845/1002454.pdf
    • http://mejawe.matsdown.com/uploads/1/3/0/7/130775350/vunileduti.pdf
    • http://files.scanmanindyeast.com/uploads/1/3/2/6/132681378/d8f8f5.pdf
    • http://malog.lesherinstrumentalmusic.com/uploads/1/3/1/4/131438304/wafaladorawebafoluzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/rovepevamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/5024806858.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3388/files/arabic_vocabulary_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6143/files/ncert_class_10_biology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/godadoritopox.pdf
    • https://cdn.shopify.com/s/files/1/0428/6277/2380/files/44407219541.pdf
    • https://cdn.shopify.com/s/files/1/0431/9589/1871/files/62425344260.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/69255326854.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0231/files/year_6_maths_algebra_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/radial_head_replacement_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/sojutikiral.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/xutug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005853.bin
48db2327e55687d95ca40f7f5f6f67b0e67dae71c94b023117a1e442ca173b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5853 4928 bytes
font_01_sfnt_off0000690d.bin
b51649fa625241e63fb61ed8e75c9c939ac28097017ebc656e4537a090296d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690D 10264 bytes
font_02_sfnt_off00008bfe.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFE 4324 bytes

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