Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d87d1622880b12…

MALICIOUS

PDF

55.1 KB Created: 2020-07-31 16:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b735f891e517ef6a9ecf739862b4922 SHA-1: 82a5fe8c3b856b0820cd1cc804882cdacd476f71 SHA-256: a3d87d1622880b127dad51e5b3ef9ab6d052f5104f2d84678fb38ff4056e2b38
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=4.+4.+5%253A+tostring+for+flowers+codehs'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. This suggests an attempt to manipulate search engine results or to lure users to malicious destinations. No scripts were extracted, and the document body is heavily obfuscated, limiting further analysis of intent beyond link manipulation.

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.cc/pify?keyword=4.+4.+5%253A+tostring+for+flowers+codehs
    • http://files.wendycharlton.net/uploads/1/3/0/8/130873783/xedenifogimuzefik.pdf
    • http://files.elasad.com/uploads/1/3/1/4/131452861/rudetokopeko.pdf
    • http://files.coachcollinsfootballcamp.com/uploads/1/3/1/1/131163683/niwaloxixaxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/sojuwolipexatapitig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/bejifilesasadafezisumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/97846544125.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/6113314933.pdf
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/98166317492.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/jarunulirunage.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/fozukubumuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/37745248854.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/xipafopusadeveriwem.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/34945325383.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_off00007727.bin
bac73d27328ce0b4fc6e6deaff7993b9324b93fd40f5171ba860280a1800902c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7727 5152 bytes
font_01_sfnt_off000088c1.bin
b7b26dfd31cef0e1208817b4c3be7def750df0ea67982529e63b6ddc7ab7af1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88C1 10600 bytes
font_02_sfnt_off0000ac60.bin
0887bc94add3ccbae2623ecc1f1fe48d304d441f3d2189e3e5b876bc141dc419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC60 16096 bytes
font_03_sfnt_off0000c12b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 4324 bytes

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