Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7735debdba1e35f…

MALICIOUS

PDF

104.3 KB Created: 2020-08-16 22:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3a66afa93d4e71b555d373a6effed99 SHA-1: ad44605763e8556a656d369f3e86d69dc48b3cce SHA-256: b7735debdba1e35f574ba6f53ff99430a00e161c0bcc0068929155c6f39456dc
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link. This suggests the PDF's primary purpose is to redirect users to a malicious site, likely for phishing or malware delivery.

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=html+css+templates+for+practice
    • http://files.kenoshamedia.org/uploads/1/3/0/8/130874683/sajejubivusufaw.pdf
    • http://files.b-readyfirstaid.com.au/uploads/1/3/0/8/130874064/bukusidiwifok.pdf
    • http://jinumef.kealohavolleyball.com/uploads/1/3/1/0/131070767/pavolufajute-vudexuwidifuwat.pdf
    • http://zubokukub.ashesofedenmovie.com/uploads/1/3/1/6/131606027/ad64d1a9a.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/jidowuzakireja.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/24312872124.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/75636734956.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/mosavexusixusaduxitosoda.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/35527778486.pdf
    • https://cdn.shopify.com/s/files/1/0428/3986/7559/files/chancroid_journal.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/65946232623.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/26303351656.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/74323325642.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_off00015ff5.bin
5829dd5eaf2ac97280eef76ccf3595afc26ab89daf332518c21fb4b7c9b5586c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF5 5124 bytes
font_01_sfnt_off00017143.bin
2b41933e8719f2ad565800772b1578f39b32d534f33c4a81ab62d6a163e55c0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x17143 10224 bytes