Malicious PDF — malware analysis report

Static analysis result for SHA-256 7621613a8641d762…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 00:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ffa1a40dd675574bdc8f4a74607dd4 SHA-1: 35abeaf7acdd1d11066847311ac2564d5e8160c0 SHA-256: 7621613a8641d7627342e4050d4b7bb4fa37190a97c31fc459d84c4548d306d1
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF link farm'. One of these links, 'https://ttraff.com/wix?keyword=edvard+munch+le+cri+analyse', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous external links points towards a strategy of distributing malicious content through a network of interconnected documents.

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/wix?keyword=edvard+munch+le+cri+analyse
    • https://static.usrfiles.com/ugd/b8c837_8216fa7f4c494031a922782d5f4b366f.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_7384bb91396a41a6a639eab4345dca38.pdf
    • https://static.usrfiles.com/ugd/0a052f_d013ee92f1f94d129e2807d8eaa13939.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_d411189d09d2440e8212fbac3cd3f8d1.pdf
    • https://static.usrfiles.com/ugd/6cf392_c2ec1fe785b7415a81198166de6da65e.pdf
    • https://static.usrfiles.com/ugd/cf14a4_2137bf14d8a5411688c9527fe81b2d28.pdf
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/9891032488.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/30859100907.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/how_s_life_going_funny_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/40517952241.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/sesopuxo.pdf
    • https://static.usrfiles.com/ugd/22bf55_7a5aa7b3dfb64f1690f34f8c8fd85427.pdf
    • https://static.usrfiles.com/ugd/87d215_43b4e4e68acd49858b4575380b24ae19.pdf
    • https://static.usrfiles.com/ugd/b8c837_545b203e077f4949b197755b78cd63af.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_off00006b38.bin
1bd5b4005ed3afcdfc0a098d6a54ce7d8cfe1eb0aca5fd004d8effff077ed7d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 5300 bytes
font_01_sfnt_off00007d14.bin
c110637ca3b4ca1dbb4113b16f289714b38140561377e96774d8b0e7236e68dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D14 10124 bytes