Malicious PDF — malware analysis report

Static analysis result for SHA-256 5159b8974bbf94ab…

MALICIOUS

PDF

36.5 KB Created: 2020-08-17 14:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1da207d62d935a187af8e06507e59d65 SHA-1: a5fe6ffbcd6f9be22b0512cb37c21ea0a0bc1041 SHA-256: 5159b8974bbf94abe2ec8fa2b664820a85dab9487e9013e8b7d90ce191b0869f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=cnbc+awaaz+market+guide+cd'. The document body, though heavily obfuscated, also contains this URL, indicating the primary intent is to lure the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=cnbc+awaaz+market+guide+cd
    • http://files.barbaraervin.com/uploads/1/3/1/3/131380128/747e181.pdf
    • http://kezazir.kstheauthor.com/uploads/1/3/2/3/132302921/4696462.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/free_expense_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/7334872672.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2338/files/wuluxiwumojejos.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1065/files/porogomemuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/jolafa.pdf
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/algebraic_equation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/7823/5798/files/give_me_everything_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/the_metaphysical_school_of_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/tekonsha_prodigy_p3_trailer_brake_controller_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/55235658768.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/18026564350.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67264452348.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/autobiography_of_a_yogi_online.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_off0000443a.bin
f8a8a87afe7c89a7d3f28bfc946de401d7839fe92573a0557322ea5232d4f0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x443A 5192 bytes
font_01_sfnt_off000055e3.bin
f5b8ae1f5a07bdb4b71f4b9649590860a9b96450e5a75b5daa17ddbdfe668f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E3 9748 bytes
font_02_sfnt_off00007744.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 4324 bytes

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