Malicious PDF — malware analysis report

Static analysis result for SHA-256 b335b03faaeb0c5a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-26 12:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f0615122dfbc1d0cd08ff36736aaa95 SHA-1: 78565c70e42f314ee6b3ea4efafe4af51d404aa3 SHA-256: b335b03faaeb0c5aa6460fa229d6e6bad530b3297fa49d60fff9e326e22bc7c2
152 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, also contains this URL, suggesting it's the primary lure. The PDF also hosts a large number of external links, many to Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing the user to a malicious site via the embedded URL.

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=how+a+bill+becomes+a+law+worksheet+middle+school
    • http://zivadid.phoplayca.com/uploads/1/3/2/6/132695278/6017263.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/2869259559.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/44899001024.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/paragraph_transition_words_for_essays.pdf
    • https://cdn.shopify.com/s/files/1/0431/4644/4960/files/descargar_audios_de_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/8800048065.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/95171111164.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/6744792215.pdf
    • https://cdn.shopify.com/s/files/1/0432/6286/9670/files/53956890268.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_off00006739.bin
30515d7f3ba7f58c6f04f50d51a7a17ec0edca0ca0fc030f54f4c225c3311073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6739 5436 bytes
font_01_sfnt_off00007995.bin
6f511639c5baa6845445d922f69efcb27364871df7b3c4e03b2390d06b8e05db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 9912 bytes

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