Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e4428a40146c33…

MALICIOUS

PDF

41.0 KB Created: 2020-08-06 12:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06199535c43635d1c998ef58fea35ff SHA-1: 4b72f663d74ac5c48be4c2e9758dc8f6e03913db SHA-256: 88e4428a40146c3311a8998862ea594da0e0335b3f123a89757ac95515ce9edb
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=anglo+saxon+culture+pdf', indicating an attempt to redirect users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=anglo+saxon+culture+pdf
    • http://files.lifton.ca/uploads/1/3/0/9/130969494/karow.pdf
    • http://files.diamondpta.com/uploads/1/3/0/7/130739986/657d5ade9983.pdf
    • http://files.hrkcmo.org/uploads/1/3/1/6/131636807/4802588.pdf
    • http://files.mariapalmerart.com/uploads/1/3/1/4/131453990/nulezeze-rapuwekama-rifepodigu.pdf
    • http://files.cooperandclaire.com/uploads/1/3/0/7/130776073/ponavawabukakekog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/600137283.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/43800681193.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/jukomajurato.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/curl_application_json.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/agenda_for_business_meeting.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/lumopurajutepozedozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/kideridufirixopej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/dolibakajoxilisewapuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/sotedeliv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/jironivujexomexijumunop.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/gijuxaxawigunixitotazaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5251/4971/files/pimaki.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/
    • https://cdn.shopify.com/s/files/1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638b.bin
c37c30656291cdcdbc6478f37ac356678f283b21eb33e7332d564680714a40bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638B 5380 bytes
font_01_sfnt_off000075f1.bin
54aafbd36689a71abc23fce86f7ae4477317cfb96492e7faff6cca1775dc0d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F1 9744 bytes

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