Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9545f3e46c5dabf…

MALICIOUS

PDF

78.4 KB Created: 2020-08-14 20:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9df0b6e298fe0377333428a77c4bc04 SHA-1: ec3982e95253aae71ac5038accd087c00d884037 SHA-256: b9545f3e46c5dabfbda7ce058de695ec3cbb1c1e05c665717f3a0c68640eaaef
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=metformin+hydrochloride+xr+500mg'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0431/6371/3690/files/gewixetitor.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the target URL, suggesting a lure to a potentially malicious site.

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=metformin+hydrochloride+xr+500mg
    • http://files.ericjsolorio.com/uploads/1/3/1/4/131406441/6923077.pdf
    • http://files.therealaeon.com/uploads/1/3/1/8/131871690/peziviwu_bupenugozuwo_fafomunudadizip.pdf
    • http://sulizubut.firefightercycle.com/uploads/1/3/0/8/130874049/3b800f7cc063.pdf
    • http://ledapovam.marion-dewar.com/uploads/1/3/0/7/130775195/3039288.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/gewixetitor.pdf
    • https://cdn.shopify.com/s/files/1/0440/0332/8150/files/biogas_bottling_plant.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/bujigadosubuluregakabopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/nejegudatigibuxogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/wuxamimem.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/3193723370.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/8802851325.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/81055660300.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/nozifakiwelok.pdf
    • https://cdn.shopify.com/s/files/1/0434/3463/9522/files/85514684645.pdf
    • https://cdn.shopify.com/s/files/1/0450/8889/9224/files/dr_collins_pcat_2015.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/xatafoxotug.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_off0000f4fb.bin
5435b1717d6464caa9ea59cb78e4f251b9b2b97291d6c67d13d6db6ff7b7f51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 5488 bytes
font_01_sfnt_off0001079c.bin
80f38779b3c61624d7d7f9d730f92a87f36a8690e7d0c7ad7a4ac86318d4d2f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 10916 bytes

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