Malicious PDF — malware analysis report

Static analysis result for SHA-256 c345b83f2054edf7…

MALICIOUS

PDF

52.4 KB Created: 2020-07-31 19:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ea4a57b994978a85cea610dbb27349 SHA-1: fb71e934b1c4571c3f83adf05f502fa71d49b788 SHA-256: c345b83f2054edf75394489e4cc37140d698b074bfa69a73bcb333a898a7373a
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic indicates that the PDF links to a known malicious redirector service (ttraff.ru), which is likely used to obscure the final destination of the attack. The document body itself is heavily obfuscated and contains the redirector URL, suggesting a lure to a 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=swift+for+loop
    • http://files.shaunreynolds.com/uploads/1/3/0/8/130874641/ade3ca2d.pdf
    • http://files.deathandseparationbook.com/uploads/1/3/2/6/132681237/fb1c9b1967.pdf
    • http://files.delcocheetahcat.com/uploads/1/3/2/3/132303170/jokogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/lelomorituvalavolazuza.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/jurikuxijenozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/xeraxezis.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/samowagogifaliloke.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/59099505855.pdf
    • https://cdn.shopify.com/s/files/1/0431/6751/4788/files/fetefutopamivawepog.pdf
    • https://cdn.shopify.com/s/files/1/0440/6870/0325/files/31341656544.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/94499321653.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/tudurunivogijebudoluni.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/99383124167.pdf
    • https://cdn.shopify.com/s/files/1/0437/4003/7271/files/witesonofepekej.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/vukilixiwujefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/12961249886.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/gegefuvajudajom.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_off00007f90.bin
267f73a5de92da57f0d7b541c0c1f423c5a8989f20e70f3f92aea9a517240784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F90 4700 bytes
font_01_sfnt_off00008fac.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAC 1800 bytes
font_02_sfnt_off0000983a.bin
db973d1db7b3064edfd451cca232ef3998b612dbd16627d3b91afe9b3f7076e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983A 13896 bytes

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