Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a24a9064c0df22…

MALICIOUS

PDF

42.2 KB Created: 2020-08-22 17:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3321e26c59460440b3f065f614dcc21d SHA-1: 60803fa18b8434e9a2aa8bd8c94f0c57e28af921 SHA-256: 09a24a9064c0df22229a3c27a650b1cde5e2b01708b27dff529526c0564dd080
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 of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.ru/pify?keyword=swayamvaram+songs++320kbps', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDF files, reinforcing the link farm tactic. The ML classifier also 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.ru/pify?keyword=swayamvaram+songs++320kbps
    • http://files.the-wordofmouth.com/uploads/1/3/1/3/131383255/0e856.pdf
    • http://rogokemob.helena-yang.com/uploads/1/3/1/6/131606027/witodikikev.pdf
    • http://files.dellariadesigns.com/uploads/1/3/2/6/132695746/mimefetogi_nusemu.pdf
    • http://files.teresele.com/uploads/1/3/0/7/130775704/feposuguninu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/sesudilijeronululomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4223/4791/files/zitebananefijisodutukemax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/52648523108.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/putijop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6327/0815/files/41419068193.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6668/files/21112940549.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9381/files/jama_management_of_sepsis_and_septic_shock.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4733/files/50714194664.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/gosixomomujusajewarena.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/sabrina_graphic_novel_download.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_off000065f5.bin
afb026baea9645b1b628c8fe412b75c61c74b0eb46fa43f57bde5febbaa5a8ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F5 6108 bytes
font_01_sfnt_off00007abb.bin
570a6c44a8a89ea3b68e66cd676d7f58e2f6924a47890c518fe01d9889020752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABB 9800 bytes

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