Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed3f736afc85eb7…

MALICIOUS

PDF

38.4 KB Created: 2020-08-22 06:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b69abe283ff5496ed3eb90a21fb6c347 SHA-1: b091563b69603c8d5092fbcd47d1bc2fad5d58a8 SHA-256: bed3f736afc85eb72791cd63632d96d78726b652de94fb5099909a3d6b7a3f03
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=reading+passage+1+flying+tortoises+answers`. This URL is embedded within the document body, suggesting a lure to trick users into clicking. The PDF also contains a mass external PDF link farm, with many links pointing to shopify.com, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=reading+passage+1+flying+tortoises+answers
    • http://files.freebirdcollectibles.com/uploads/1/3/1/4/131455832/xunusomukoj.pdf
    • http://files.brain2gain.com/uploads/1/3/2/6/132696174/zegarivuluj.pdf
    • http://files.colburnart.ca/uploads/1/3/2/6/132695416/7647794d5762.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/dopitowaxovukizav.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/64653171089.pdf
    • https://cdn.shopify.com/s/files/1/0433/7297/0133/files/65610591805.pdf
    • https://cdn.shopify.com/s/files/1/0428/9950/5311/files/63380564799.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/dilukokatosedisarisikag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/ripovagix.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/jurnal_tentang_argentometri.pdf
    • https://cdn.shopify.com/s/files/1/0428/3265/8588/files/xikatedudupejelana.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/voluwimesekezisasafutodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/rumus_payback_period.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7949/files/fraction_comparison_worksheet.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_off00005963.bin
842ddac9ebae222adf4201a65790bf11b875be5f1c0e54e07e1bb9c7684d3a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5963 5460 bytes
font_01_sfnt_off00006c24.bin
7a1b0b46e50b154f69f733db884984f87de92e1fd5eb5492db80c8d594b7a71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C24 9756 bytes

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