Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9c349cb93ca2f0…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 15:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a20d4baae34b7dada8a2bf6454041ec5 SHA-1: cfa9e064778de248ad3339414aa67650d2322f9a SHA-256: 5f9c349cb93ca2f0776affad442ffe19beff3e5fd9c3ee99c8ca24c1ab69aee1
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 PDF files hosted on Shopify. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking PDF links, likely intended to disguise the malicious intent.

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=steven+universe+rainbow+quartz+2.+0
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/b._com_auditing_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/sogikin.pdf
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/urgent_work_leave_application_format_for_office.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/ciencias_sociales_7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2561f96755046cd95a132fba1d20e7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9789c00d347f4b03877ef1bc5c59f908.pdf
    • https://static.usrfiles.com/ugd/b8c837_006d4e787088457b9cadd742c8512cb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_16f9b168beec40f4aba744411290e806.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/custom_steve_models.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/paxotim.pdf
    • https://cdn.shopify.com/s/files/1/0434/8231/6957/files/gazutit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6180/4198/files/ranudoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/93798830076.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/top_10_ed_games_on_play_store.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/electrical_engineering_multiple_choice_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006468.bin
565df9c579b294e76fc8f56f60bad4b1b6c7525e8ddedfbb0f5659e5d7b21f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5408 bytes
font_01_sfnt_off000076f4.bin
ee4e0be16cba67beb8e850af60a3dcc7ccb2b5b2377e742e7b3a903cec09bf58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 10912 bytes
font_02_sfnt_off000099eb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EB 4324 bytes

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