Malicious PDF — malware analysis report

Static analysis result for SHA-256 71342fa34b0cd38b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-12 17:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b6a60a3bec3f551a826531fc82d2763 SHA-1: e89f7fc48a8504fbdfc72a77a2fa0445fc534d36 SHA-256: 71342fa34b0cd38b05f59397cfdb26c924ce9a64c7a04328a6ff6232de9d086d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'spoken english pdf free download kannada' and the malicious URL, suggesting a lure to trick users into downloading further content. The presence of a link farm and a malicious redirector indicates an attempt to distribute malicious files or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=spoken+english+pdf+free+download+kannada
    • http://files.kanahau.com/uploads/1/3/2/6/132682051/880f0d.pdf
    • http://xuwij.patchesfamilycreamery.com/uploads/1/3/1/6/131607131/bikuzexesaf_juminumol_vetexajiba_fewaxemafefo.pdf
    • http://dabuwaj.christinereid.net/uploads/1/3/1/3/131383483/8475664.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/zojotuna.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5211/files/52703480406.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/dowaxotukadabe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/rojetomoxewosidasofogup.pdf
    • https://cdn.shopify.com/s/files/1/0439/1898/3323/files/1415309336.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/levivitisetevakawalevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/inspired_beginners_spanish_podcast_10_este_mes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/coordinate_system_transformation.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/93801652125.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/nakesofeledalul.pdf
    • https://cdn.shopify.com/s/files/1/0437/8941/8657/files/8262644251.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/basel_iii_bis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/mobile_application_architecture_design_and_development.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005795.bin
515e1af188fe4c8e6d28808d449f7497133d1a4b148319a05527a96a8cae650c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5795 5560 bytes
font_01_sfnt_off00006a8f.bin
a9e54bd19ff6036d52a178c4e3b903b0468ee916d0ffbbebf0fe8ee0221bc0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8F 4812 bytes
font_02_sfnt_off00007b96.bin
c147e0943e40f191df3edc780df3112aad485d6dc0836e47d1121a0cc680cbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B96 10044 bytes

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