Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0a1ac8310443f9…

MALICIOUS

PDF

53.8 KB Created: 2020-08-07 12:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04675f85efee6a04ffd970b3d7c5cbb0 SHA-1: 778d8496f103f1930c4dc536e810563459936e5f SHA-256: 4c0a1ac8310443f9f23ead9e7be19c0b29bae1fdff09785507bbbdae26b23db4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to a known malicious URL. The document body, though heavily obfuscated, contains the malicious URL, suggesting the intent is to trick the user into downloading a malicious file disguised as a PDF. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=management+of+amniotic+fluid+embolism+pdf
    • http://files.smile2340.com/uploads/1/3/2/8/132814949/9814794.pdf
    • http://files.johnsonhoopbuildings.com/uploads/1/3/0/9/130969728/83f986f.pdf
    • http://files.rossalexandermason.com/uploads/1/3/1/1/131163898/27d3d0110ed3366.pdf
    • http://files.sdadata.org/uploads/1/3/0/8/130813818/botij-kodidekudikukix-relebixazeki-ruxupemopuwaj.pdf
    • http://files.bigyogaonline.com/uploads/1/3/0/7/130776049/jumawobazomafuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/64935680235.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/sokofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/53155225316.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/2815522177.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3396/files/jutozamij.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/61058575071.pdf
    • https://cdn.shopify.com/s/files/1/0432/2046/7869/files/13770399514.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/wedding_planner_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/jijiwiga.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/rorajekixovinizubi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/soxenebipevigitatomapow.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/lazonubosipimowikar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/bebozoruguwejedi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/aeropress_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e7c.bin
5f24f03f8d2fe0b6e363441a27b36ab1fdebb718f5895826748aa0b01ee7ec46
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7C 5524 bytes
font_01_sfnt_off0000914b.bin
e7898d7a0b9ddd35a8644f9ea60a7f3cf069bfa374e2aec137e35a9581e0e134
pdf-font-stream PDF embedded font (sfnt) at offset 0x914B 10080 bytes
font_02_sfnt_off0000b3ea.bin
aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 16148 bytes