Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffc531f4e14cdef…

MALICIOUS

PDF

43.0 KB Created: 2020-08-04 22:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac0fc4c55079a73cb996572cc10dff2 SHA-1: 7d9d6a723f02815ced63d48b3a98f4999784d607 SHA-256: 9ffc531f4e14cdef712a850631861deaa1d5b10f7e59215d5636119de062ad0f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, a technique often used to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=lesson%20plan%20for%20maths%20class%206%20pdf%20in%20english. The document body, though partially corrupted, also contains this URL, suggesting a lure to trick users into clicking malicious links under the guise of educational 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.ru/wb?keyword=lesson%20plan%20for%20maths%20class%206%20pdf%20in%20english
    • http://files.collinsvillecrimsoncadets.com/uploads/1/3/1/6/131607062/jepuxego.pdf
    • http://files.365downandout.com/uploads/1/3/2/7/132710780/1407151.pdf
    • http://files.penandswordproductions.com/uploads/1/3/0/9/130969298/tifuneka.pdf
    • http://files.cdconggiaovietnamvic.org/uploads/1/3/1/0/131070911/4648145.pdf
    • http://files.givingissocial.com/uploads/1/3/1/8/131860125/bc5857a193781e3.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/icy_veins_warlock_leveling.pdf
    • https://cdn.shopify.com/s/files/1/0428/6654/0700/files/matchbox_rocket_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/xiroxowefotigolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/wexetetapiruwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5033/5384/files/oxidative_stress_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/fokofututemot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1808/files/pejevorizimisuxipabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/tafezisozubegadawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/vivotiwavibokaxunufan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/php_web_scraping.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/tajepixofazu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/nys_geometry_regents.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3773/files/ungleichnamige_brche_addieren_und_subtrahieren_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7270/files/tabixulitugafumajivul.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_off0000696e.bin
9ea312ee07bdf15b04ba0e6f3a8d0de68ba92b7394986572b078324212df9794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696E 5664 bytes
font_01_sfnt_off00007c8e.bin
05f65b75dc1bdf094b90a0ec92826c3f2d937e20b524e145f506f5857ec33ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 9936 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.