Malicious PDF — malware analysis report

Static analysis result for SHA-256 961a2d3926886f0a…

MALICIOUS

PDF

34.0 KB Created: 2020-08-23 16:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 766d43990e280db3e3f177f087308078 SHA-1: c8aa0836b7e732b8e5e875b0e03dbad61e434791 SHA-256: 961a2d3926886f0a2c4f6b4dcaf305da99a8bafe195f68dd4ad369cb4d657d11
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. This suggests the primary function is to redirect the user to external content, likely for SEO spam or to serve further malicious payloads.

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=ben+10+ultimate+tamil+movie
    • http://warabaxud.adossdesigns.com/uploads/1/3/0/7/130738524/waguvuwigori-fibegudumalumi-fogisajul.pdf
    • http://files.teenchallengeofnewmexico.com/uploads/1/3/1/3/131378942/7063551.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/large_stencil_letters_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/uptet_written_exam_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/ziripiwumipu.pdf
    • https://cdn.shopify.com/s/files/1/0456/5142/7495/files/acls_ecg_and_pharmacology_pretest_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/czech_republic_visa_form_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/80751195265.pdf
    • https://cdn.shopify.com/s/files/1/0435/6194/3199/files/marvel_universe_vs_the_punisher.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/fozegojolefepik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/28145202420.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_off00004870.bin
f713fec62867d8ff8d567b53f8479f21d929449491780f953ff8a73e4ddac26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4870 4860 bytes
font_01_sfnt_off000058f9.bin
bd8d11c3ec2423c297a6699d90f42ce55d581ff8e6717885eafa844445a01abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F9 10196 bytes

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