Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d14a91c1caef9c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-15 02:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80d6d942338bf0e4d5668035c2fc841 SHA-1: 7bb2e3ca3e5399ce0f5ec9f226bde19eedb6bd4c SHA-256: 33d14a91c1caef9cce1c2e0b7db67d75140526f162d963d17914c16495b72410
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and a list of other URLs hosted on Shopify, suggesting a link farm or lure. The primary malicious URL is likely used to redirect the user to a further malicious destination.

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=certificate+format+for+project+sample
    • http://files.barrettwater.co.uk/uploads/1/3/2/6/132696598/situwodifadej_nosamud_baxiperasi_lupaxevewup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/wapobupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/81133798305.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/puziritotesokebate.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/28050898488.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/22083505994.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/vupuzifixubulonesejelup.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/softball_score_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/gaxinuxarine.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_off000064c8.bin
a82663857d819d96418a0db5393b804e23bcb3226a749e451cfa246c214bf8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C8 5144 bytes
font_01_sfnt_off0000762e.bin
3058d0b72c1e20c919e09ede686e719ba24aef926de7590f271e25ca24c7cd4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10068 bytes

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