Malicious PDF — malware analysis report

Static analysis result for SHA-256 579c9e85b847acce…

MALICIOUS

PDF

34.2 KB Created: 2020-08-13 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecf6041a6af65e88aa44f6b2fbd5b720 SHA-1: e8ef15001143a3275075059420a7f30c9615b016 SHA-256: 579c9e85b847acce4639f22868e65bbd63cbde3a73adc9cc2674beb890c0b9b0
154 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 technical document. The document body itself is heavily obfuscated but contains the same URL. The presence of numerous links to Shopify-hosted PDFs suggests a link farm technique to improve search engine ranking for malicious content. No scripts were extracted, but the primary intent appears to be redirecting the user 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.com/pify?keyword=autodesk+fusion+360+introduction+to+parametric+modeling+pdf
    • http://files.tmsapvo.com/uploads/1/3/2/6/132696214/1589242.pdf
    • http://lukid.southerntierstarlites.com/uploads/1/3/0/8/130814411/4269997.pdf
    • http://files.mantramelts.co.uk/uploads/1/3/1/4/131407148/6131361.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/94697121419.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/89785647485.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/70161714340.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/sivaledomogudujegi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/rujavulexogexizepo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/68851767843.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/pivimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2392/files/acetato_de_etilo_hoja_de_seguridad.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/coeliac_disease_diet.pdf
    • https://cdn.shopify.com/s/files/1/0437/4049/6033/files/appointment_request_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2445/files/vevug.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/sigominobiniwagulidavafox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9465/3594/files/psi_tutorial_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9989/files/danadebitogib.pdf
    • https://www.amazon.com/Autodesk-Fusion-Introduction-Parametric-Modeling/dp/19431
    • 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_off000048a6.bin
9d1fbf3df784893bd3483a6b94b973ca06de392913f8037762ab6be65087824c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48A6 5988 bytes
font_01_sfnt_off00005ce8.bin
cb350ddfe2a24b3247067908edb89d439149b6f2a4e7fb6a973572165825ff1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE8 9008 bytes

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