Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bfc62857c89c9a…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 08:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da6558624e8c5bff1efdb5ef3c6dd67b SHA-1: ed828f4ddb5196de6c165b2c1efafaa425f00d59 SHA-256: a3bfc62857c89c9a21a7a3c43fcadf30205120fab5b8fb7a940b99675f7d2fa1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, embedding numerous external links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting the primary intent is to lure users to malicious content via these links.

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/wb?keyword=eschatology%20death%20and%20eternal%20life%20joseph%20ratzinger%20pdf
    • http://files.tntnyc.net/uploads/1/3/2/6/132680813/a5e0c41d88.pdf
    • http://mekajak.beattrunk.com/uploads/1/3/0/9/130969352/jenuputifoni_desep_lurenusuminevuj_lifimebidaso.pdf
    • http://wegilefi.porkypink.com/uploads/1/3/0/9/130969772/9c94d9.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/wuxupazonajori.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/91105189269.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/kesuginokod.pdf
    • https://cdn.shopify.com/s/files/1/0429/0831/9907/files/kixagikabuzuraxurud.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/92443856058.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/xunafisisatotumovemufi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/28384625413.pdf
    • https://cdn.shopify.com/s/files/1/0432/6293/5200/files/anabolismo_y_catabolismo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/97527866647.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3201/files/noelle_easton_2013.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/67824521389.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/74116707739.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/74916210211.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/accounting_principles_and_concepts.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f48.bin
b59cea7ab7f5a821a80330e08887bc55e013eaba11e36c879b2e82fcf5ca37e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 5600 bytes
font_01_sfnt_off0000825d.bin
dd71a7480097d44f0705be648b22c2f58be1bac4561cbf4b13aa4372cf4d2471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825D 10368 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.