Malicious PDF — malware analysis report

Static analysis result for SHA-256 488e8d635984540b…

MALICIOUS

PDF

43.2 KB Created: 2020-08-24 14:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9135c6d333fc5dc0fd477aec39525c SHA-1: cbb6583ca3ba763e1e059b879d078364acbb3e60 SHA-256: 488e8d635984540bafa0b5d9a3bdf01442e79b03a928760955451e256da85944
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=blackboard+collaborate+launcher++mac'. This URL is presented to the user as a download for 'Blackboard collaborate launcher mac', indicating a social engineering lure. The document also contains a large number of embedded links, many pointing to shopify.com domains, which is characteristic of SEO poisoning or link farming techniques to obscure the malicious redirector. No scripts were extracted, but the primary attack vector is the malicious link.

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=blackboard+collaborate+launcher++mac
    • http://files.fhbcfortmyers.org/uploads/1/3/0/8/130874612/viloroluxaf-pironu-wupekosemobikuz-padovup.pdf
    • http://files.finleyeaston.com/uploads/1/3/1/4/131406202/4bf7d015f.pdf
    • http://files.levelupwithaleana.com/uploads/1/3/1/3/131379874/bd29587.pdf
    • http://files.whimsicalsragdoll.com/uploads/1/3/0/7/130775182/ropegizulomexu_palini_vigise.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/tabubonemalisawu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/christian_desktop_backgrounds.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/28424185414.pdf
    • https://cdn.shopify.com/s/files/1/0436/1581/3795/files/deductive_argument_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/solivoli.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/95802952679.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/33758194993.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/matesumomodarikobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/wufogediragegibotes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/92620317659.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/6517375494.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e00.bin
c654403e3a2bb6a24723658217f62b5b0153a1649094ba8bb75a30770da35f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E00 5088 bytes
font_01_sfnt_off00006f0d.bin
5932b126b74a1a0ff60db38d0d50ab10257e4d1325ada545ddec10a32741ec7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 10368 bytes
font_02_sfnt_off000091b8.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B8 4324 bytes

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