Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbded97c4c8e8c0…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 11:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8d97cf454055c94f2f9fd2a07c0319 SHA-1: 0619e9cc3910e51d67602a60ffb453ccccc23aa1 SHA-256: efbded97c4c8e8c07eaeb55461e5e1bf4a75490fe8d48e093e8a1d4aec90f5f7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to shopify.com domains. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to the malicious 'ttraff.com' 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/wix?keyword=misturar+ingredientes+em+thermomix
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/angular_2_local_variable_in_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/5501/3275/files/48538398800.pdf
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/analytical_skills_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/4088/9240/files/91222328432.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/pixeke.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/meguxubujuvegelarilow.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/pilumokujofofati.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/past_simple_regular_verbs_worksheet.pdf
    • https://static.usrfiles.com/ugd/9e53d4_a81f7b3ed55b47bda9d8411ebb5f4d52.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e3a1a91089740da936be81dd4e13c1d.pdf
    • https://static.usrfiles.com/ugd/e4a001_6e9221da71784dd4be9d91f4d1fed6d4.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_b5ece1ef03aa4736b32b1caafd109685.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/tevurejewanemag.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/dazubibamofonek.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_off00004e81.bin
7d3431d0c3a6b203df8c7fbb905133e1a7bf8c6e8dac0a7664eca015330e2a31
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E81 5280 bytes
font_01_sfnt_off0000604c.bin
659b0800a4c93cffdcebc3e035c572af862b4cf68a787a9a5044ca1891d9a578
pdf-font-stream PDF embedded font (sfnt) at offset 0x604C 14688 bytes