Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d76c6839982608…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 07:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0cfa486c794446acd71e94417e96e98 SHA-1: 1963bc2c253d14e2c045a993a6385d0c365de0bf SHA-256: 85d76c68399826085df83113f977ae448ad77e6eb8f57e2360dd828827d65314
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link, disguised as an editable D&D character sheet, redirects to a known malicious domain. The ML classifier also strongly indicated maliciousness.

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=dnd+5e+character+sheet+editable+pdf
    • http://files.mgdesigns1.us/uploads/1/3/0/7/130738912/1739539.pdf
    • http://files.sterlingreputationspr.com/uploads/1/3/2/7/132740804/mazaribil.pdf
    • http://files.hasaicogroup.com/uploads/1/3/1/8/131856409/zogimikabokej_gigejefuji.pdf
    • http://ladofa.theinkparlourkelowna.com/uploads/1/3/0/8/130814297/5216273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/foxivefulitixexofuxexudoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59968820953.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8005/files/xasazama.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/8125041837.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/varodusi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7101/files/91354044054.pdf
    • https://cdn.shopify.com/s/files/1/0437/2601/2567/files/meyers_snow_plows_wiring_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/xumir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/2353612725.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/lasufapesedediwezev.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/foxabovodipojaxus.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/sixapuxinisoponexa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/52722824690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/jakaviwizarufosudozojatam.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_off00006ea4.bin
8a82c7fb4d1b16eefe9900aa15d45209749e066869a9d754772fb4cafbba0338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 5504 bytes
font_01_sfnt_off0000814c.bin
45fe4280e3351d054bdde1def04420bef0f69680af2c2b7a146b835e0d4065e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814C 10864 bytes

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