Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d20d624282cd3e…

MALICIOUS

PDF

37.1 KB Created: 2020-08-04 03:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41bceb898c50f84541b5687b57c12a93 SHA-1: 03fb0e64de29ea676f2a57c51ed6701341fc5f9e SHA-256: a8d20d624282cd3ecfeecd2dcac777db9ecd60954d099ed7d0aa9676e1d0473a
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=automatic+writing+machine+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF link, suggesting a lure to external content. The primary intent appears to be redirecting the user to malicious infrastructure.

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=automatic+writing+machine+pdf
    • http://files.battambangparish.org/uploads/1/3/2/6/132681002/d767baf407e6.pdf
    • http://files.sascelledesigns.com/uploads/1/3/1/8/131857818/bobaravizidawu.pdf
    • http://files.artz-rva.com/uploads/1/3/1/4/131453982/bbbfb0.pdf
    • http://files.ollrichva.org/uploads/1/3/1/6/131606672/7006847.pdf
    • http://files.shesthefirstwisconsin.org/uploads/1/3/2/7/132712006/dapuvizupedana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/kurejugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/20630043483.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/demutejinepijo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1654/2632/files/daxonoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/vugopavak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/45210763805.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/gifubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/taramekusesevafiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/javapurinotes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/49011928916.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/liwitijasagebikukak.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_off0000530b.bin
1bc5e2151128970fb5b39bf5de754f30d80154ab1033b192e5b599d75d46e628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530B 5440 bytes
font_01_sfnt_off00006570.bin
7e187229e1059d0d9e4eeb625886c2e7f6bd8e363d174e3db959da64e8020b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 10172 bytes

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