Malicious PDF — malware analysis report

Static analysis result for SHA-256 441c84310df7f143…

MALICIOUS

PDF

44.5 KB Created: 2020-08-29 17:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da5d7dff7c056cce3637813c2727399f SHA-1: d6bb53a666802b07cd605167934007b5d33d26ef SHA-256: 441c84310df7f14399196327f386ee888a5b71253632aa465bcf1a771168015d
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to heuristics indicating it links to known malicious redirector infrastructure and contains a large number of external PDF links, forming a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=polar+flow+android, which is likely used to direct users to further malicious content. The document body contains garbled text but also includes the same malicious URL and several benign-looking URLs, suggesting an attempt to disguise the malicious intent.

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/wix?keyword=polar+flow+android
    • https://static.usrfiles.com/ugd/b8c837_1b71d75ab8ef4596b2a344b295b1484e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7430fe01572444d5a71cf611f5bbdda0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7547b62a960b4f7ba97de62b12829a1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_03390ac34df9441d9a302a3a14ef0cba.pdf
    • https://static.usrfiles.com/ugd/4d6844_3807e3e092d14b3fb1e178adeefff1b7.pdf
    • https://cdn.shopify.com/s/files/1/0461/5376/0931/files/event_management_web_templates.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/jexujunudos.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/10138147265.pdf
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/2686659833.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a2caabb41684b3a81bc8e9d9db780bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4d8fb8f5c4e45459aabfa5bcd063d47.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f77ea9c83974f9f843a3cbb524bf040.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5e59c406f5943ea85f6bfef37352d0f.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004698.bin
aff50d758d89a88b748e739763c063b6f83e9f6194e6d7db95598e543b396eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4698 10268 bytes
font_01_sfnt_off0000683a.bin
69bdf30fdc03f1d710769f9452bce817c2bd52d0ed019ec2a0637a3efab28daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683A 4816 bytes
font_02_sfnt_off000078ae.bin
289854c0292170102eeea8cd8d9fa039b7e5adf06f71653ea533c14c4e2d2c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AE 2140 bytes
font_03_sfnt_off00008288.bin
4431fc530908b986894ff1018c1eba5b0df914451b3ac72acd1e726c0db08538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8288 9396 bytes

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