Malicious PDF — malware analysis report

Static analysis result for SHA-256 a488f0d439bfd428…

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 05:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b077b91f99b30b198c4b2644ea16424 SHA-1: 822a67ac6ee3c0465842d63404f52a0af4d3a1e9 SHA-256: a488f0d439bfd4282a14741c2dbc82f7bc2677e2f756fe0a5f496f20fa5a57c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link that, when clicked, redirects to a malicious URL associated with known redirector infrastructure. The document body text, though heavily obfuscated, contains the string 'Okey plus hilesi indir' and the malicious URL, suggesting a lure for users seeking game cheats or similar content. The PDF also hosts a large number of external links, many pointing to Shopify, likely as part of a link farm to improve search engine ranking for malicious content.

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/wix?keyword=okey+plus+hilesi+indir
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/geverukemegefozeduze.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9082/files/vozele.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/pigezigisewivezami.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8514/files/33830755085.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/computer_arithmetic_algorithms_and_hardware_implementations.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ba3f0352f94de98ec1d584422ec232.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d2c3bb36f12404e811aa3ac48835d09.pdf
    • https://static.usrfiles.com/ugd/0d089b_240cfb4eed0b40fe8d13c1215c779372.pdf
    • https://static.usrfiles.com/ugd/b8c837_abebc3777b5b4a4f8867a1f155e4821f.pdf
    • https://static.usrfiles.com/ugd/db1da1_0052e449e607434e800db164ffb27960.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/lemigenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5153/files/strikethrough_text_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/boats_and_birds_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/jenunoneket.pdf
    • https://cdn.shopify.com/s/files/1/0449/3757/6603/files/effective_email_communication_in_the_workplace.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/91832169212.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_off0000728c.bin
bdf61c666e9de64c128a8636fa78baf66ac947b76c9885f4c13245f9b5b4d8f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728C 5032 bytes
font_01_sfnt_off000083a2.bin
250b9c1d78eba7edd0bc18677b10eee2a7b961ac741ae9d596ce111f4f24b486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A2 12736 bytes

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