Malicious PDF — malware analysis report

Static analysis result for SHA-256 7766ef1d847c0309…

MALICIOUS

PDF

56.0 KB Created: 2020-08-05 16:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 508aa07c5939dfb49e6c41633485f3d4 SHA-1: b73cec1a79546f78f9944facfcca8554701cec9c SHA-256: 7766ef1d847c03098d7b738599c0ea88d1d92c19965e5b14f92a20324f388176
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=les+bact%25C3%25A9ries+ana%25C3%25A9robies+pdf'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. These factors suggest the document's primary purpose is to lure users to malicious infrastructure.

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=les+bact%25C3%25A9ries+ana%25C3%25A9robies+pdf
    • http://files.kasara-resortcondo.com/uploads/1/3/0/7/130738993/2264609.pdf
    • http://files.brendamccullough.com/uploads/1/3/0/7/130776309/korebonimikaju.pdf
    • http://files.nubiangoatskentucky.com/uploads/1/3/1/4/131454034/getela_vagar_vupixizigos_rirori.pdf
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/nox_shuttering_performance.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/ladef.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/80770120088.pdf
    • https://cdn.shopify.com/s/files/1/0433/6074/7688/files/74666454434.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/7179694788.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/28293772066.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/mebularamovut.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7605/files/pelevalitarisij.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/vnc_server_macintosh.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/gozitopejedazemabisipevis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1629/7368/files/xalutigilosewodij.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_off00009705.bin
2532737ae21ad198ba8c0805a4d4f30c671a927f0473acd8c3c8557fcb8948a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 5340 bytes
font_01_sfnt_off0000a8f8.bin
a26b9f17002b8bc27ac3d02b0a04d6b696bc884b4b2ea23edbc24057cd4c7478
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F8 12976 bytes