Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa33d6918d680226…

MALICIOUS

PDF

33.5 KB Created: 2020-08-13 20:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79a54dc9a64998e67722260208434ff8 SHA-1: 4135982ecee6f97bfb329f8f25b1b307060c77a9 SHA-256: aa33d6918d6802260bb761a93f5ed8d3a1deff7e92a617f57118c6b9e3f9fa0c
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=introduction+to+insurance+mathematics+pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to PDF files hosted on various domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of a malicious redirector link is the primary indicator of malicious intent.

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=introduction+to+insurance+mathematics+pdf
    • http://files.agiorgiti-residence.com/uploads/1/3/1/4/131407194/dufadedez.pdf
    • http://files.swshdc.com/uploads/1/3/1/3/131383483/jufobegaj-wamiwijubiba-zasoza-pifos.pdf
    • http://files.eastcincyogaschool.com/uploads/1/3/0/9/130969791/6946707.pdf
    • http://files.insightcounselingc.com/uploads/1/3/0/8/130813961/zimuregetuzu-zavizeg-paligorava.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/25010998290.pdf
    • https://cdn.shopify.com/s/files/1/0428/5916/7900/files/mckeague_trigonometry_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/20150684406.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6982/files/bring_up_genius_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/mevikiges.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/poruzogawaferudoboranof.pdf
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/barron_s_sat_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6003/files/78952056503.pdf
    • https://cdn.shopify.com/s/files/1/0436/4104/5145/files/62767472674.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/troybilt_horse_tiller_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.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_off00004670.bin
8753ac5b44347d76315918caa13fc01f3ace29d0a26dc0c0a407cfa44260cf4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4670 5300 bytes
font_01_sfnt_off00005844.bin
c02732d4351eb84539a4d2ced797d3ea3291cd3cb23ad383b84691f135d5b172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5844 9804 bytes

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