Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe05f3a926dd0cb…

MALICIOUS

PDF

33.4 KB Created: 2020-08-17 13:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb64330a4d108d05953cf28178e7183 SHA-1: 20c9e7fa71fcde22573f053235362a4be2b42e6f SHA-256: 7fe05f3a926dd0cb1b4a222d6af781c5d1951603a8b40d39e8849df45f7cad4f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though partially garbled, suggests a lure related to a movie theme song, likely intended to trick users into clicking the malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=bhairava+movie+theme+song+ringtone
    • http://files.taylorlench.com/uploads/1/3/1/3/131380596/9928250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/nibaxisogolegote.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/diggy_cool_math_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/absalom_absalom_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/geometric_and_arithmetic_sequences.pdf
    • https://cdn.shopify.com/s/files/1/0438/6675/1131/files/7766616522.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/adobe_air_runtime_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/6010/9210/files/duredimibamolilopuwezep.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/keto_connect_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0446/3358/7875/files/best_cisa_study_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/94495346104.pdf
    • https://cdn.shopify.com/s/files/1/0448/4546/5762/files/mongoose_bulk_insert.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/gowaguzanarixog.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8837/files/36495160214.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/gestion_de_la_calidad_total_lluis_cuatrecasas.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_off0000465f.bin
b0cd8cad77338ca33caf268c03f73cb0545473c9a2a982bd90199be674c8fe22
pdf-font-stream PDF embedded font (sfnt) at offset 0x465F 5176 bytes
font_01_sfnt_off000057dd.bin
49f8b3c8e74ab7cef4e4e004e0b4f576695cdf02ba37533480d1e11ebda1e590
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 9568 bytes