Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d13d31bd1245a2…

MALICIOUS

PDF

47.7 KB Created: 2020-08-06 17:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0516b98e1dbdf919305f3fd86c0c383 SHA-1: 0eeb562df0464270a61adb32f02f4205a9bae4db SHA-256: 78d13d31bd1245a2f8f17aa73e58acc43daeb1d950380485ea5edc8066992d8d
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'assembly language programming basics pdf' and includes the malicious URL, suggesting a lure. The presence of many external links, including to Shopify domains, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=assembly+language+programming+basics+pdf
    • http://files.eleanorroseoutdoorquiltshow.com/uploads/1/3/0/9/130969158/runopatilo_goxikotew_gemiwowezexel_foxofi.pdf
    • http://files.lovealaska.org/uploads/1/3/1/4/131437532/nuwiw.pdf
    • http://files.chichestersecuredog.co.uk/uploads/1/3/1/3/131379939/gilonazakelajo_rofirexot_wimiwazusigi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/51533486229.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/pikoluxuriraweji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/33902027993.pdf
    • https://cdn.shopify.com/s/files/1/0431/5483/3557/files/19688281293.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/27500112719.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/analytical_chemistry_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/6566586146.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/gamipogaviveroja.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/36772955597.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwizesovipijekugufex.pdf
    • https://cdn.shopify.com/s/files/1/0436/7895/7718/files/59455852008.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_off00007b27.bin
62be721be92d4eebce10157107fe04aead17d419c2f1f568f5aeb8c9d524db8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B27 5708 bytes
font_01_sfnt_off00008e85.bin
eb3673db7505d16ec4a27e768825ba2fab2394e4d6bf87ac3f8a836dfd256194
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E85 10340 bytes