Malicious PDF — malware analysis report

Static analysis result for SHA-256 166486989c129134…

MALICIOUS

PDF

46.2 KB Created: 2020-08-08 20:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b697ba2cad88e0d728b5b4287c6aafa1 SHA-1: b83341d47f2c133a433113aed44876db530fe77f SHA-256: 166486989c129134f23c421c746aa63c8727fd363eb9f2be7bee9a1b20307201
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector service. This suggests the primary purpose is to redirect the user to malicious content, likely for phishing or malware distribution.

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.com/pify?keyword=proyecto+de+investigacion+cuantitativa+pdf
    • http://jasenifi.thestorefrontgallery.com/uploads/1/3/1/4/131438759/madifupovugo.pdf
    • http://pataf.carmenvanhaeren.com/uploads/1/3/0/8/130814328/dakusiforepud.pdf
    • http://files.roseandsun.com/uploads/1/3/0/8/130814056/mejetawuxeboj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/15384927010.pdf
    • https://cdn.shopify.com/s/files/1/0433/5878/1590/files/jawudabusefigijazusutepij.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/dibawikezudiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/zekezivifodiralosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/xogutopafekelosumilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/mimeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/18863914292.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/nodaputimuwe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/44731626136.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/tujako.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/jufopubup.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_off000072a8.bin
ba8bdbfdd6d781e5f9fdb686fb97a771a8e1c358f255e492ad12d6b94b6390ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x72A8 5456 bytes
font_01_sfnt_off00008553.bin
79faf3eca22f6328ee8b2d6114169189aa9c75bda1059002e87a1937fa4bd114
pdf-font-stream PDF embedded font (sfnt) at offset 0x8553 11628 bytes