Malicious PDF — malware analysis report

Static analysis result for SHA-256 37633d4356533265…

MALICIOUS

PDF

44.4 KB Created: 2020-08-29 16:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187c179b11af002535e921304b3388b2 SHA-1: 68100600987267fd601feb33c514417ac7d17186 SHA-256: 37633d435653326555e63c836403411412c0f15f22b7cf5fe0cf849c26b240b0
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 also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness.

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=tipos+de+arrastres+primeros+auxilios+pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/52695295462.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/characters_not_allowed_in_filenames.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/revobaxezofazur.pdf
    • https://cdn.shopify.com/s/files/1/0435/6286/0699/files/remorif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/7801137900.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3232/files/fusionner_2_pages.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/28582247954.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/98515388199.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/jutapomovulutitudutif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/wevimaforaxozaxi.pdf
    • https://cdn.shopify.com/s/files/1/0462/6336/9882/files/locomotive_breath_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/buvinaruwunaguvajuvasan.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/65487000547.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006208.bin
1aabff22b208296ecb733479f102f9208fd088bb3fd9f4ccce7df1bb74de00ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x6208 4980 bytes
font_01_sfnt_off000072fa.bin
a3cce2a90c1e96e64c51bb8c0a2bc36435788222cf051d96bb62096d491e86df
pdf-font-stream PDF embedded font (sfnt) at offset 0x72FA 10904 bytes
font_02_sfnt_off00009691.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9691 4324 bytes