Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3007c461daa138…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 11:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199f3cc5c84139548b8d13bba6aeb8a1 SHA-1: e66b87927f431b6c0c6e500161604b134f6d584c SHA-256: 8c3007c461daa1380a114de11b5e97dbaa50fc1dfb1e9cfb01d2e4e1c495cf52
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.cc/pify?keyword=how+to+draw+shear+force+and+bending+moment+diagram+pdf. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially obfuscated, appears to be a lure related to technical diagrams.

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.cc/pify?keyword=how+to+draw+shear+force+and+bending+moment+diagram+pdf
    • http://files.capstonechiro.com/uploads/1/3/1/4/131453256/38073.pdf
    • http://files.amkmusic.com/uploads/1/3/1/4/131453645/zexefujutewexones.pdf
    • http://files.getfitwithcharlie.org/uploads/1/3/0/7/130775813/8890915.pdf
    • http://files.protectourspace.org/uploads/1/3/0/8/130874330/f3e765d7938.pdf
    • http://files.fionasenton.co.nz/uploads/1/3/0/7/130775431/9255697.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/6584134271.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/55704782236.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/93033410115.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/88972940005.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/22000719777.pdf
    • https://cdn.shopify.com/s/files/1/0434/5154/7800/files/naraturepojizonexexeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/kopawulebimor.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/mubatawasebemaze.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/3524845633.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/janubelexirexejudawifaxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/86201600956.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/60857168651.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/tedeta.pdf
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/lefodelaresukadititisedor.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_off00006f6b.bin
8fa3e0997f03de1bce8f0f38a17e20d8df7cb14cb9895ffdcf5b4b683f69aa28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6B 5732 bytes
font_01_sfnt_off000082d7.bin
11e8cf9d57e266c30f4ea24870806179754efd9cb30535c9b4c8a9df10d0a0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D7 9904 bytes

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