Malicious PDF — malware analysis report

Static analysis result for SHA-256 248e5e2436d8dc0a…

MALICIOUS

PDF

53.6 KB Created: 2020-08-06 00:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a861fd29a9ee57c8549415cb0d6fecd4 SHA-1: 247efe0c7a251bc1852083eeaa870c9ecff62ede SHA-256: 248e5e2436d8dc0aa6238edfcaff37b604bbfa6cd33b79b0b1321c308daeba3e
150 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its structure, which includes a high number of embedded links designed to create a link farm. The primary malicious link, 'https://ttraff.ru/pify?keyword=antibiogram+test+pdf', acts as a redirector, likely leading to further malicious content. The document body contains garbled text but includes the malicious URL and several other PDF links, some of which are hosted on benign platforms like Shopify, potentially to lend legitimacy. The ML classifier strongly supports the malicious verdict.

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=antibiogram+test+pdf
    • http://files.macrofinephotography.com/uploads/1/3/1/8/131858661/linuzo.pdf
    • http://files.bristolprivateclients.com/uploads/1/3/1/4/131406288/melukelale_zolovaril.pdf
    • http://files.animalsaretoocute.com/uploads/1/3/0/7/130775432/tarodefodava.pdf
    • http://files.redmosaicjewelry.com/uploads/1/3/1/4/131437532/vifew-redixufegikul-zukumezawaxa-senuwifirub.pdf
    • http://files.yottaearthhome.com/uploads/1/3/1/4/131453588/xajeditidil.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/biodegradation_of_xenobiotics.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/vipevavowepofedorupami.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/27768912894.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8504/files/nuzosabutemoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/33830122235.pdf
    • https://cdn.shopify.com/s/files/1/0439/4837/6232/files/cg_cahps_survey.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/82386440839.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/40459800657.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/85836482777.pdf
    • https://cdn.shopify.com/s/files/1/0437/7398/4919/files/pofukipikopuxavag.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/national_holidays_2015_us.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/wurumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/super_mario_run_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7038/files/99740853006.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_off00009314.bin
61236fa0a2398c16b21856c122578926105295faec67335e9d0d90ed896de132
pdf-font-stream PDF embedded font (sfnt) at offset 0x9314 5456 bytes
font_01_sfnt_off0000a58c.bin
b2cf9c2911729d40081b8fa8c25447ab2916d9db1bc1a8d6d0285b3ef84943d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA58C 10664 bytes