Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6358f5d8215f532…

MALICIOUS

PDF

42.3 KB Created: 2020-08-25 03:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a97bdb39ced5bddc86b6d9eb779019 SHA-1: a19f0279cfcf4951a29aba6ecafb1c815bd41243 SHA-256: b6358f5d8215f5320a64e8873502a5f9bf5ba1b5fdef481381153291ba89ccdd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=household+responsibilities+worksheet`. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify-hosted PDFs. The ML classifier strongly supports the malicious verdict, indicating a high likelihood of this document being used for malicious redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=household+responsibilities+worksheet
    • http://dugokuma.codyeickberg.com/uploads/1/3/1/3/131380771/f2278c6d06d340.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/5350342354.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9893/files/44561919935.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/pusokuxusazojejafewak.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/basemakinifafalip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/xoxulop.pdf
    • https://cdn.shopify.com/s/files/1/0459/1462/0053/files/crusader_quest_challenge_3_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.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_off0000610c.bin
a1f12885a6db7057484f44c6c340b5306fddbbafa4bf0c5dfe35556a86b809a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610C 5092 bytes
font_01_sfnt_off0000725c.bin
223880d24eedec4baa80ad0a1e465a596490150fd959b419f26a7ebb290f13a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725C 13172 bytes

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