Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a60cbbe4feaab6…

MALICIOUS

PDF

41.9 KB Created: 2020-08-26 12:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 633719070a2354a98be84cca2e55306a SHA-1: 61d25a10c75dbc4d97e2ea0618c8f86d5d00b125 SHA-256: 18a60cbbe4feaab6d46b0d793c6577e35d84d32e23ab32b1dec08960a0021d3e
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 external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=omg+oh+my+god+full+hd+movie+download`. The document body, though heavily obfuscated, contains similar URLs and text suggesting a lure for movie downloads. 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.ru/pify?keyword=omg+oh+my+god+full+hd+movie+download
    • http://mitejip.peeldistrictslac.com/uploads/1/3/1/0/131070161/63979714.pdf
    • http://files.packmeinursuitcase.com/uploads/1/3/0/8/130814355/1181197.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/vepovelafaxiwimosugatiti.pdf
    • https://cdn.shopify.com/s/files/1/0439/4749/1486/files/beautiful_wallpapers_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/diccionario_portugues_brasil_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/intermediate_circulatory_system_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/71738840953.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/77195502925.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/sozaketozokapaxuge.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/894016533.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/11649765793.pdf
    • https://cdn.shopify.com/s/files/1/0439/9444/8030/files/lover_birthday_cake_images.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/46575931712.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_off00005f76.bin
39a3e436bb83dff662a317b98a8b68202e90fe2d1ef575b19a5325fdbc12ab29
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F76 5328 bytes
font_01_sfnt_off00007198.bin
6a618927be3184f3cd856a8762533829b5241df90e6e46b304949d9eb3367133
pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 12864 bytes