Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d718312d1841a3…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 12:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e09bcb1df8ba7dd78b1a2c463e4f7b SHA-1: bd6223f05617325da02a16cc1a5baee12c27e80e SHA-256: 79d718312d1841a30b203c2e254d16dd78ef662120543eb4826af0d16f75f70a
154 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 Shopify domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/wb. The document body, though heavily obfuscated, contains references to educational topics and the same URLs, reinforcing the lure. No scripts were extracted, but the presence of numerous links and the malicious redirector indicate a high likelihood of user redirection to harmful 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.cc/wb?keyword=sumas%20y%20restas%20con%20llevadas%20segundo%20primaria%20pdf
    • http://files.spraysafeplaysafe.org/uploads/1/3/0/7/130776594/kigirige.pdf
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdf
    • http://files.jessicasnyderedits.com/uploads/1/3/2/7/132740892/8852695.pdf
    • http://files.onecityhistoricalfoundation.org/uploads/1/3/2/3/132303320/zovavatiguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1255/2864/files/hp_pavilion_g_series_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/egyptian_architecture_history.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/riwodajadowugunufij.pdf
    • https://cdn.shopify.com/s/files/1/0428/8577/5519/files/64670000603.pdf
    • https://cdn.shopify.com/s/files/1/0435/4375/6954/files/les_automate_programmable_industriel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6083/files/josoluzozibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/lonatasafobikanefusepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/wovasefigajojomivowiluniz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/3185593539.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/63047232346.pdf
    • https://cdn.shopify.com/s/files/1/0434/7304/3622/files/acta_constitutiva_asociacion_civil_formato.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3664/files/simon_xt_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/discord_link_formatting.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/muwukitateno.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_off00005ce9.bin
236300367da8d6469263d17aa924292066a3cade74ad09e96358051a44ae7e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE9 5740 bytes
font_01_sfnt_off00007067.bin
c091e84a12c98926b7acfec812f4633399a83a513ef1af9e1b745df71489bb4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7067 10320 bytes

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