Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f03b5aab02129b…

MALICIOUS

PDF

44.6 KB Created: 2020-08-12 03:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0701070b3d0c97d7586a402fab0cb132 SHA-1: c54e689264a3f077dd2fb9e9e59583c8b4a8fcea SHA-256: b7f03b5aab02129bab8d3e6933ad7ba8a7afa3af83c80e6d1888f73c06e288df
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for "is sumatra pdf safe reddit". It also features a large number of external PDF links, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=is%20sumatra%20pdf%20safe%20reddit
    • http://files.queersfordinner.com/uploads/1/3/1/4/131437919/vojererapibif_judexunumafun.pdf
    • http://dodogotaz.hundredspremium.com/uploads/1/3/0/7/130776728/tugadowejijijuvirep.pdf
    • http://files.windowviper.com/uploads/1/3/1/3/131378776/zubolikafibo_legopose_xiweguvij.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/2830314852.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/76883002104.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/34657319188.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/zofoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6116/5723/files/77391194128.pdf
    • https://cdn.shopify.com/s/files/1/0431/5352/2850/files/baixaki_filme_jogos_mortais_1_dublado_em.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7779/files/college_accounting_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/58154156300.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/jotilomu.pdf
    • https://cdn.shopify.com/s/files/1/0451/0813/4053/files/5th_grade_math_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/38956888489.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/61553212275.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3735/files/19837190689.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_off00007089.bin
9fb943334f9ad124052d1c5eb987144e4a0950c2b3406d7a3f79ec6cded58491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7089 5092 bytes
font_01_sfnt_off000081b8.bin
d1f76b9f377bb39def76a8a17f2c9f34a824f6c1c046c576655e090e682b4205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B8 10512 bytes

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