Malicious PDF — malware analysis report

Static analysis result for SHA-256 664eef9c5ece6766…

MALICIOUS

PDF

32.9 KB Created: 2020-08-10 09:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 379629036d70626f36ffd87375467858 SHA-1: edc368691f4c911e214c6215494350d99b474f60 SHA-256: 664eef9c5ece6766616941f09d5f6550ff42f6b2e84e0520badac030a4f3ee4a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body itself is largely obfuscated but contains a URL that mirrors the malicious redirector.

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=nitrogen+and+its+compounds+questions+pdf
    • http://files.riverroadflowers.com/uploads/1/3/0/8/130874482/bibufak.pdf
    • http://zezej.stereo-microscope-store.com/uploads/1/3/1/0/131070420/c048d78e759b4.pdf
    • http://rulewigu.toledotowing.net/uploads/1/3/0/8/130813612/lujinudamotagu.pdf
    • http://ruridusi.trevoultersouthdevons.com/uploads/1/3/1/4/131407469/c2a376.pdf
    • http://files.madhuritherapeutics.com/uploads/1/3/1/4/131407299/fexipigisuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/kojoxuraluge.pdf
    • https://cdn.shopify.com/s/files/1/0438/9735/6443/files/git_config_ssh.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdf
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/16867988370.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/8868091877.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73633131036.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28664871254.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/xetuluzidobofadomuwipano.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/lusoxififarirema.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/marveloptics._com_scholarship_essay_contest.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_off00004505.bin
6eedfc6ff770d810fef69aba016e7de7e748f61dab852a72d65e7154c1cce3a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4505 5540 bytes
font_01_sfnt_off000057c9.bin
4577256fdc3d5c4f66edbd5303145c82f634acca5024d5a7dc58061816da8ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 9048 bytes