Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c0cd3a793c7eed…

MALICIOUS

PDF

39.8 KB Created: 2020-08-15 19:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f2e20ef63019d06e0455490955793c6 SHA-1: ca74d154997f7af574b3710d71a8149475788e50 SHA-256: 23c0cd3a793c7eed8999f1f3ed86997fe66acc9a56bfba8cc5deb7ff81c2ffab
120 Risk Score

Malware Insights

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

The PDF document contains a mass external link farm, with one URL specifically identified as a malicious redirector. The document body text, though partially corrupted, includes the string "earned leave format pdf" and the malicious redirector URL, suggesting a social engineering lure to trick users into clicking the link. The presence of numerous benign-looking PDF links hosted on Shopify suggests an attempt to blend malicious links with legitimate ones to evade detection.

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/wb?keyword=earned%20leave%20format%20pdf
    • http://files.maggiewatkinsdoula.com/uploads/1/3/0/8/130874328/povepa.pdf
    • http://dupifox.markcramerartist.com/uploads/1/3/0/9/130969173/basirijavufoti_fopazav.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/8119842291.pdf
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/sopike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/wheelocks_latin.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/limbo_pc_emulator_for_android_4._1.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/gefoduxizutixofafutuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/75938199767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/kavirelezosaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/66784211538.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/kipitovazedisunubovim.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/lenzie_meadow_primary_school_inspection_report.pdf
    • https://cdn.shopify.com/s/files/1/0443/2855/0556/files/longman_academic_writing_series_1_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/jokiwuvafivejinofim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/applied_physics_for_engineers_wiley.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_off00006022.bin
71849be174aea61d5bb41ace1db0741bc32b7faa861f93493cb513536671485a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6022 5028 bytes
font_01_sfnt_off0000712b.bin
aa67ffeee2bbad13e6358caa22485d99a994115f69c7a9e1f7a59fc3070fdb0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 9780 bytes