Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e375d24464c1c8…

MALICIOUS

PDF

45.7 KB Created: 2020-08-09 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c70346eb0ce00f7def73209f0bb10d7b SHA-1: 2c81bb6dd992631a0db34a491aa639b246f46b0c SHA-256: a5e375d24464c1c8bfc7b46ae8f1e163ed10f020baba34223689e4b9f0313122
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, 'https://ttraff.cc/pify?keyword=peptic+ulcer+disease+pdf', which is presented as a medical PDF. The document also hosts numerous other PDF files on Shopify domains, likely as part of a link farm to improve search engine ranking for 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.cc/pify?keyword=peptic+ulcer+disease+pdf
    • http://jadipukin.1mosaicsoul.com/uploads/1/3/1/4/131407005/739487.pdf
    • http://files.janine-kitzen.com/uploads/1/3/1/3/131380390/susagomonixurar_mexajogebaketuz_ninoma_zepexezerux.pdf
    • http://files.aplmuseumpasses.com/uploads/1/3/0/8/130813818/f8e857d.pdf
    • http://pilef.spiritualteapot.com/uploads/1/3/1/4/131407424/sijididigovob.pdf
    • http://dolodud.shopraebtq.com/uploads/1/3/0/7/130739415/bugepedotebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/toyota_corolla_2013_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/99968183734.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/dufazizikevumapodog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/caterpillar_generator_operation_and_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1898/4352/files/busqueda_y_recoleccion_de_informacion.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7203/files/kopetowowimabufol.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/kokebelenupazugugiteleziw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/lazinilufugaxemuzurabob.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/fairy_tales_with_pictures_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/xuxabapovukowolonufa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/87106206084.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/tevogabimitekota.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_off00007496.bin
ea561a478f17421da818a9a115bc935196e8c52cb9fc43912944dcbb9e458fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7496 5152 bytes
font_01_sfnt_off00008626.bin
3beff5f9ff480e305b7a14e156ca2830c73a79b301fbc26bb44efb0ae84c443c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8626 10636 bytes

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