Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc41d07cd932e3a…

MALICIOUS

PDF

49.2 KB Created: 2020-08-03 11:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14f510f8220fc7b2cf15127774173c0 SHA-1: e93b93f33dc77e076d857da781e4c8149b1292e1 SHA-256: 5fc41d07cd932e3a37689c2324ec8bc6559eb5411292441f4c4a9361a077e6ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious objective. The ML classifier strongly supports the malicious verdict, and the document body, though heavily obfuscated, contains the same URL. No scripts were extracted from this sample.

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=understanding+how+to+fight+the+good+fight+of+faith+pdf
    • http://files.yecsonline.org/uploads/1/3/1/6/131637606/javaxaxojibunodub.pdf
    • http://files.dartendistrict.com/uploads/1/3/1/8/131856381/jarukid.pdf
    • http://files.gaventrinidadtheatre.com/uploads/1/3/1/4/131406365/7107289.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwofejimu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3767/0041/files/libew.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/xesefameviris.pdf
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/supofozavu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/jokirusorilatudemowoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/xokatelilow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/lanujumopexikuxapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/wokazonevofupuraxijoxijuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4734/5573/files/73845441688.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57896919986.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuwakuda.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007269.bin
579aa40e47da61227fd0e0fc9e964c1bd4683a3d89946289b3df5bfc21e715e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 5140 bytes
font_01_sfnt_off000083ea.bin
8d1909ba1e59af80ac78af377af1bb7d46e345d8b7965dbf650d030cafa526a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 10912 bytes
font_02_sfnt_off0000a8ba.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BA 4324 bytes

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