Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78a3f140ca35afa…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 19:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d90b800da29f333907340b2fbcb8ab SHA-1: ffde2e02fbe2cf788f21dfdb7248dcc68b527b81 SHA-256: b78a3f140ca35afaa241f93951d08e0b730ee7d563809e5ba4e585efc60f452b
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 or SEO manipulation, with numerous embedded links to external PDF files. One of these links, https://ttraff.cc/wix?keyword=formal+imperative+conjugation+spanish, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is driven by the embedded 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.cc/wix?keyword=formal+imperative+conjugation+spanish
    • https://cdn.shopify.com/s/files/1/0459/9663/8375/files/definite_guide_to_position_sizing.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/belt_factory_factorio.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1285/files/s_chand_biology_book_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7526/files/kaplan_nursing_entrance_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/husqvarna_automower_435x_awd_bedienungsanleitung.pdf
    • https://cdn.shopify.com/s/files/1/0440/8338/0376/files/dawaluxegatarezataliko.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/vomegolidateb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/buxax.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/facebook_lite_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/77132177638.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/66293845515.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/lisukiba.pdf
    • https://static.usrfiles.com/ugd/804ff6_1316d56899f64b959393a40ce99ad895.pdf
    • https://static.usrfiles.com/ugd/b8c837_0498c0ee08044bf8bb70d73c57a1bc4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b55d7aa8a7e486188f28762806ae8be.pdf
    • https://static.usrfiles.com/ugd/b8c837_67710c0cfd694f7d96f786230b9ed7a9.pdf
    • https://static.usrfiles.com/ugd/67e251_594d6142a73f4afd816a247f11069537.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_off000069d5.bin
f012de5e2a3d39ee5165ac04f097d9b9ed998e0d57f7a255f471114b347f93eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D5 5436 bytes
font_01_sfnt_off00007c36.bin
32054e9ad39bd89718600778a785c943862d6d9f1bb82deb748987726c84a359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C36 10124 bytes

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