Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2534fb2ddc716f7…

MALICIOUS

PDF

46.1 KB Created: 2020-08-21 06:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36904690269d49af90d8591215ee0189 SHA-1: 82b041221e20960a5cc6551624f7d36d99fc8762 SHA-256: b2534fb2ddc716f742de742174c59d4d6e3e5cceae7780c1b0ab413930f7fd3c
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic specifically identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external links, including those hosted on Shopify, suggests a link farm designed to obscure the ultimate destination and potentially distribute malware or conduct phishing. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=chori+chori+chupke+chupke+full+song
    • http://bejaza.jokerjitsu13.com/uploads/1/3/1/8/131856543/1e9d2573b99c.pdf
    • http://files.sweetfirenotecards.com/uploads/1/3/0/7/130775109/gixavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/61356795025.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/99684748549.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/cursive_alphabets_capital_letters.pdf
    • https://cdn.shopify.com/s/files/1/0434/4066/8838/files/zuxeluvole.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/the_secret_chamber_borderlands.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/32522592458.pdf
    • https://cdn.shopify.com/s/files/1/0430/5613/6341/files/fobud.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/convert_to_vertex_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/89465193272.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/bazurevevemu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/serological_tests_in_microbiology.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_off000061eb.bin
a97a340f4cd97787e0d4b0ad8cc8e1ec7def241a67987f7c882378deafb05cdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x61EB 5036 bytes
font_01_sfnt_off00007316.bin
c937d6ce8e9afdfa80e8fb308b4035a55707d3bfb0f984f16c75e22cf3701bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 10208 bytes
font_02_sfnt_off0000964a.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x964A 16164 bytes