Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9e86405945d353…

MALICIOUS

PDF

41.1 KB Created: 2020-09-17 14:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81a848eea6d27585c287aa73a582cac SHA-1: 41992c92d875770bb55b9628e9b75db53b799b8a SHA-256: 0b9e86405945d3539e86ef853fc48c5166de2c5782174ac51b3ba8d5a32520c1
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 a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a manual, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL confirms this.

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.club/wix?keyword=alesis+dm10+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://990db145-6438-4ab4-a39a-b80fb256f013.filesusr.com/ugd/1e533a_069220417b9846e3b2a514c0ec4aae3b.pdf?index=true
    • https://f371d8f3-6377-4c0d-a516-e29aaaf6d071.filesusr.com/ugd/b90ba1_35b44d52531b45a6a45cd07f1e85e472.pdf?index=true
    • https://e9eeb3e0-2bd7-4a91-a3c7-40b613141c51.filesusr.com/ugd/39cb9d_61bec89b917d4e95a2637274f29e275a.pdf?index=true
    • https://08a05f08-0e49-4d8b-9c8c-837ad625875b.filesusr.com/ugd/e0d0cf_b550c548e24d42f2a81811cfa2599ae2.pdf?index=true
    • https://6eff6716-61b8-4e38-9a42-7cc1e0d345fb.filesusr.com/ugd/50988c_a5aa061af9f94319b8b8695d0e55a90d.pdf?index=true
    • https://66bb4aa9-3e9a-4cde-9ef8-b38b5cf0441f.filesusr.com/ugd/bb4607_efbe8c95b59449d9b5e0f671bb990bb7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/wuzerazez.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/zuwuxizaruvurok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/deposoweda.pdf
    • https://cdn.shopify.com/s/files/1/0446/2955/7411/files/celtic_alleluia_sending_forth.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/acuerdo_marco_europeo_sobre_teletrabajo.pdf
    • https://498ae0f6-53fa-494e-a2ba-1ca0ec7ed512.filesusr.com/ugd/8a9bcc_a5d0bbdd83b04bfda5981952748b4c37.pdf?index=true
    • https://81c5107f-3f24-40ec-9472-3ad997b5dec4.filesusr.com/ugd/bc79a4_4c2f3d9575994b2f9ded6b3df0409f0c.pdf?index=true
    • https://6b645744-04d8-4db8-a79d-46154a4a8d06.filesusr.com/ugd/5ed537_cee67b98451b48988db332eca6820d04.pdf?index=true
    • https://ce9c8aea-a6b0-46cb-865d-cb4ac64b6311.filesusr.com/ugd/c7ef1a_2d9e31c9f9854933b0e90abb6ab5bf5b.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006432.bin
eb7b8e9e93a2f2ca583a3260d37a131249155e1afb0a3e8e62b6dbba64af6c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 5056 bytes
font_01_sfnt_off00007557.bin
ad7faac2d056ce9315e347557a158efb5ca67f0dbf9120aaeb8be0c907a01895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 10160 bytes

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