Malicious PDF — malware analysis report

Static analysis result for SHA-256 a067a8a3c349d130…

MALICIOUS

PDF

42.5 KB Created: 2020-09-22 02:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1cf421e76980e814d0bad1e3f375b67 SHA-1: 12e444becbd208fe06b806da329552687c124730 SHA-256: a067a8a3c349d130514352ab9af9eab0c60a101873c57995e934decc40a2f1ff
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to 'Yugioh spell cards worth money'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking Shopify URLs, likely part of a link farm to improve SEO for the malicious content.

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.me/wix?keyword=yugioh+spell+cards+worth+money
    • https://cdn.shopify.com/s/files/1/0465/3921/0911/files/99332750101.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/37686578524.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/kuvawozinagonumuputo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/6131171979.pdf
    • https://cdn.shopify.com/s/files/1/0429/2847/2220/files/31255852681.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/trip_to_bhangarh_movie_moviescounter.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/kofoxiwabebokegebora.pdf
    • https://c2b35366-7be6-40d7-abfb-17c28bd6b38f.filesusr.com/ugd/4cf28d_b0e9298ee8c84cd3861ac15bc3512e51.pdf?index=true
    • https://1693fd4b-64b1-4349-a74a-fdc255f22457.filesusr.com/ugd/0010c8_8d682d11a1cb4329b053637a65125680.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/9924/9058/files/kavenurarakizapofisozaxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/nelifiremipesudixuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/tl_nails_tampa.pdf
    • https://cdn.shopify.com/s/files/1/0457/7093/2390/files/b._sc_chemistry_syllabus.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_off00006560.bin
8cb05c248de3ab0110c06834c8770e358ddca79709138238e1d019700cde0249
pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 5644 bytes
font_01_sfnt_off00007891.bin
8e202716e531730f945a4f484c3439a4e3615e3c23b43421ad4f7d42c6ac0e60
pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 10796 bytes