Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34a928d092b39ba…

MALICIOUS

PDF

48.9 KB Created: 2020-08-12 04:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 296b87f3623d261b0ea61a8865cca15a SHA-1: 4551f5ce8a8c103e13cd6f0ae523d9cb32a5d40f SHA-256: f34a928d092b39bab34fdf477b2d37b88ea9bb916c2e568cdab82c988bffd087
154 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 external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though partially corrupted, contains the same URL as the malicious redirector, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=comment+fusionner+plusieurs+documents+word+en+un+seul+pdf
    • http://files.patrickgfahey.com/uploads/1/3/0/8/130813992/ruzuwizu.pdf
    • http://files.pukanaface.com/uploads/1/3/0/7/130738548/8766123.pdf
    • http://musodaw.susan-mcmahan.com/uploads/1/3/0/7/130775557/vugajatod.pdf
    • http://files.oursaviorelc.com/uploads/1/3/1/4/131437229/9840759.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/vipajagadakezosekajinox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/24935503190.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/suwisofi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/17477642013.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/financial_accounting_reporting_analysis_and_decision_making_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/diviser_en_plusieurs_pages.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/osrs_runecrafting_calc.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/university_application_form_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/fios_tv_guide_arlington_va.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/kozekuwitebapa.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_off00006ed8.bin
402770129332943c06d09c7200462c60b1a4fb9196d854d5254fa7bec7bbe45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 5088 bytes
font_01_sfnt_off0000801f.bin
ec73931c5590f0a512c90091054fa0664fe83d7b71b97ffbde4b2b23dbf805f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 12284 bytes
font_02_sfnt_off0000a635.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA635 4324 bytes

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