Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e7dc880430a880…

MALICIOUS

PDF

51.4 KB Created: 2020-08-07 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2528070ff96eea2ff0c30af1848457 SHA-1: 67a265156b763f7a7e5d23d4c04a9f856ee02b42 SHA-256: 91e7dc880430a880928832891793f52f98c0006e86333dab4bac145c0ae3f9d1
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of a malicious redirector URL is a high-confidence indicator of a phishing or redirection attack.

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.com/pify?keyword=apparatus+theory+pdf
    • http://files.hollistonxctf.com/uploads/1/3/0/7/130739776/misurigin-luxaxe.pdf
    • http://files.kathrynprice.co.nz/uploads/1/3/0/8/130813639/3764113.pdf
    • http://files.safetechconstruction.com/uploads/1/3/1/6/131636855/fifedurisalit-roziki-vubuvu-valekarepen.pdf
    • http://files.creswellpres.org/uploads/1/3/1/4/131438038/sazukugogulakokil.pdf
    • http://files.goodnote.ca/uploads/1/3/0/7/130739247/kubofop.pdf
    • https://cdn.shopify.com/s/files/1/0435/9802/0767/files/laxabidamaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6079/files/geankoplis_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/9938/9080/files/72270066035.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/54677168950.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/87697027852.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixozuxixewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/ecology_and_environmental_science.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/pawopepezoxukebakebufunaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/34617512429.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/jajunejirebufovug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/wikerorise.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/33591880612.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/34243057156.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/
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/ecol

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ebb.bin
4cf51cb2c747e95ca8a060469714e0fefb3d19e0a82e824c8c7538cd12f5ce4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBB 4916 bytes
font_01_sfnt_off00008f91.bin
4634803263e036fecb1368d49898c72a2a3dd6fa9f52e4a48f9fa59e1c625ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F91 10128 bytes
font_02_sfnt_off0000b200.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB200 4324 bytes

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