Malicious PDF — malware analysis report

Static analysis result for SHA-256 c581b87e057d5ce0…

MALICIOUS

PDF

46.4 KB Created: 2020-08-15 04:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee44e520bdbe04e5a75a38e79151fa64 SHA-1: 5d063b908fe47d16575c649f3d031d48aca5577a SHA-256: c581b87e057d5ce08656013c5eb180d42ac5d2c76f89d42a817b49b1d831a8c8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document also hosts a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the intent to redirect users.

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.cc/pify?keyword=voltage+transformer+used+in+substation
    • http://files.thinkgrafix.net/uploads/1/3/1/0/131070146/5073220.pdf
    • http://files.ccmomc.org/uploads/1/3/1/8/131872178/44a8afac.pdf
    • https://cdn.shopify.com/s/files/1/0429/2503/1590/files/95422371344.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/tineberejiwalaremupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/maps_for_clash_of_clans.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8453/files/automated_irrigation_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/vatewimirugidak.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/kivapujejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/laminijavibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/koxogazixonuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5912/5153/files/morifobulonapiludagiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/2134602911.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2791/files/66904880915.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/9857997820.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac2.bin
25e6e9eec55b8b566a54ccc294896c9ea7b20569c9d2a7735525e08dc1d9f583
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC2 5216 bytes
font_01_sfnt_off00007c5e.bin
80b3fa6066d3bdc42b977674c3432e31a7fb30cb99f8e7fa70b80b8689d068b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5E 10120 bytes
font_02_sfnt_off00009edc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDC 4324 bytes