Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f9ba13e98de33f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-02 18:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 783d2887e6a5a4444bf2952f59c295a4 SHA-1: d0228219333f5dec1efdb6db7fc6240288c89932 SHA-256: 21f9ba13e98de33fb8857ddec77ce11b12ed7e711741b58e817e482fb0fbc9b4
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it's a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=sierra+bullets+reloading+data+pdf', which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, including several Shopify-hosted PDFs. The primary malicious URL is likely intended to lead the user to a phishing or malware distribution site.

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.com/pify?keyword=sierra+bullets+reloading+data+pdf
    • http://files.darrenwilson.net/uploads/1/3/0/8/130813769/2500768.pdf
    • http://files.usedmufflermachinery.com/uploads/1/3/0/8/130813301/ruxevagugel.pdf
    • http://files.straightfromtheheartinc.org/uploads/1/3/1/3/131380292/6666583.pdf
    • http://files.esproductions.net/uploads/1/3/1/4/131455636/nebozitegadon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/sukotarep.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/12119507840.pdf
    • https://cdn.shopify.com/s/files/1/0428/1742/1479/files/48743089662.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/96235910218.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/xiwaziwovevomojususave.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1125/files/cents_to_dollars_converter.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/nevegakesob.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/94877560884.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/24149145069.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/zufegod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/37745248854.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_off00006161.bin
732369afb6de79b65d63937a37bfba163176e91574c8d14b1090af702b33835b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6161 5452 bytes
font_01_sfnt_off000073ed.bin
ba8e62e06e19f410442f033f6cb3343ae3dfbfa9a21f7c071107e3bfb9cdcf9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73ED 10168 bytes

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