Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dac79cf91fe6dc…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 00:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d4163d276a0b86616114d4429e4a8ed SHA-1: 3d014e05ac89697e3179f4485113f70845499201 SHA-256: 08dac79cf91fe6dcedc38d87621ee969fc49ade908e64e2e30155791c093671b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though partially obfuscated, contains text related to inserting PDF files into Excel and references the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=insert+pdf+file+in+excel+sheet
    • http://files.doodadsandfandangles.com/uploads/1/3/2/6/132680901/ronifawodizod_setupuvosukuf_wewofokodefeju.pdf
    • http://files.dunollycottage.com/uploads/1/3/1/4/131438234/26e14.pdf
    • http://files.jtdudrow.com/uploads/1/3/1/3/131384436/8539154.pdf
    • http://files.toyourjoyaromas.com/uploads/1/3/0/8/130813357/1809611.pdf
    • http://files.littlecreekneedleworks.com/uploads/1/3/0/9/130969710/9585647.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/16901074687.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/63949237727.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/star_trek_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/lerofilipewix.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/98026592884.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/30049226491.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/52686191445.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/mamexawobapigevopad.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/24045728586.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/64551238319.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/36934220756.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a37.bin
0b4299af46afa6ba1b5a42dc2a66fffaf010e45d15c92a25ec632a60b54e63a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 5036 bytes
font_01_sfnt_off00007b5e.bin
6d76275730217294153b0c7d3682d9a35c02904e40240e08e0bb0e408b0daa34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5E 9828 bytes

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