Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7175843e0a8c91…

MALICIOUS

PDF

32.1 KB Created: 2020-08-18 17:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6438a3f29d78ea3e37ca3074495deb33 SHA-1: a12369eb1a78c57ca3cfd7997f3f313364418340 SHA-256: 0b7175843e0a8c91460d851fc14b0525835749710412eecd9c589e009aa8b5d9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, https://ttraff.ru/pify?keyword=scratch+program++to+making+games, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, likely due to the redirector link.

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.ru/pify?keyword=scratch+program++to+making+games
    • http://zasotak.nicksrunclub.com/uploads/1/3/2/7/132712109/e50a8c89d9c055b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/pumeripuwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/cool_scratch_games.pdf
    • https://cdn.shopify.com/s/files/1/0435/3638/4149/files/52255560951.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/jafonig.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/economics_dictionary_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/72220142206.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/jubirakasixo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/siguwawinugiwopefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91337380597.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/85624368083.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004171.bin
ed5aef372a1561a06d536e415dd4c1d39e54d34c19d77595b360ec30e87995d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4171 5480 bytes
font_01_sfnt_off000053e8.bin
adf27eeb2cea0f8d604b6441a02b76a53f3dd7c0899fa575ccef6a1df5703ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x53E8 9384 bytes