Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6be3027da827995…

MALICIOUS

PDF

43.9 KB Created: 2020-08-01 11:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c754482774597e47446916fd637b75 SHA-1: 0e1148bb9e1ac725abd573e375749d9ff4c79478 SHA-256: b6be3027da827995da19c78b79b3438f5003bf9cc51809ea8fcaad6187dd54a6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a prominent link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Homemade adderall recipe' and the malicious URL, suggesting a lure to entice users to click. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, likely for SEO manipulation or to distribute the malicious payload across multiple domains. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this document.

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=homemade+adderall+recipe
    • http://files.truurelief.com/uploads/1/3/1/1/131163578/2485848.pdf
    • http://files.julianoshea.com/uploads/1/3/1/4/131453807/jibumojexoje.pdf
    • http://files.shoesforstudents.com/uploads/1/3/0/8/130873949/6d782e2f.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/nulama.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/64720776348.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/50314936125.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/kirokozufovojepugevujuso.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/weguzezuwoxudujezaxut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/pojuwakexavebupavotokut.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/suruveluzurixadipakuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8173/files/vonalajobatarupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/38235818029.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/wakinaxugaxadanewoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/97772580961.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/72737452180.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/26248062439.pdf
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/xovefokegifomajewiti.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_off00006f9f.bin
afdd470e0f95dfd920cf6c5c406701a6c0505a88f6a4fcde88530b00b539c221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9F 5000 bytes
font_01_sfnt_off00008082.bin
57c72f90c88e208cda50b998bbbf1fb1a1646626b5806f507ae5069bde95a151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8082 9924 bytes

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