Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a60c9d7475e4e7…

MALICIOUS

PDF

40.1 KB Created: 2020-08-22 01:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2964ab0757deafaf8f6d8e03badb5a1 SHA-1: 69d0fff76a6addf850e2c611814d03b9bfaab70d SHA-256: f1a60c9d7475e4e7ef2778cd268ac37ad23f82b8c8d405d7f058d49267962a97
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=paper+flower+leaf+template+free', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other links to benign Shopify PDFs indicates a link farm strategy, likely to improve SEO for the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=paper+flower+leaf+template+free
    • http://files.hammeriefarm.com/uploads/1/3/2/6/132682565/8671ab9e.pdf
    • http://files.camdenscrusade.com/uploads/1/3/0/7/130739122/4265305.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4550/files/my_revision_notes_edexcel_a_level_economics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/bizixunivizimagajes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4335/6825/files/89214840187.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8824/files/what_is_apartheid_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/6966359249.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/adverb_of_manner_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6727/6454/files/44767504138.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/30705808435.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/62074484707.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/ielts_speaking_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/cours_automatisme_hydraulique.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_off00005fff.bin
bc897a3e1f7f5b17313051377c368dccaea79e17a8420399cbd3cd9bd5e07ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFF 4960 bytes
font_01_sfnt_off000070da.bin
3ebc0e793fb016c498583d6ebc9264c33e82e0b08557dc680497299507949e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10232 bytes