Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab340cc6dceb13ca…

MALICIOUS

PDF

41.4 KB Created: 2020-08-13 18:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3855ee3dd681603821097bf151f31044 SHA-1: 1f05cc3a49b96dfad20dd072276f251147ffd523 SHA-256: ab340cc6dceb13cafd142cf6455eee9ae5406259b96ff2321cddac5f51239369
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/wb?keyword=soap%20for%20internal%20medicine%20pdf%20download`. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious redirect. No scripts were extracted, but the embedded URLs and the malicious redirector link are sufficient indicators of 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.ru/wb?keyword=soap%20for%20internal%20medicine%20pdf%20download
    • http://files.greenwoklethbridge.com/uploads/1/3/0/8/130813985/f95fa.pdf
    • http://files.nubiangoatskentucky.com/uploads/1/3/0/7/130776578/3408795.pdf
    • http://files.clare.church/uploads/1/3/0/7/130776164/1985270.pdf
    • http://files.lsbdacademy.com/uploads/1/3/2/8/132814427/5500431.pdf
    • http://files.ahglawoffice.com/uploads/1/3/1/4/131437535/90e5718a1d.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/intel_core_i5-_6600k.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6582/files/how_many_gallon_in_a_liter.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9647/files/69414709876.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/40919666492.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/9572161232.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/xeguvedokavazilig.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/vmware_workstation_15_pro_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7601/8585/files/military_survival_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9870/files/adobe_printer_spooling.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/wordpress_xml_sitemap_without_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/counterparty_credit_risk_collateral_and_funding_brigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/duraw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/dusekuvofesib.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_off00005f91.bin
467b316cebda77353783237defce5c748436fb4f1fb948a13edad4737614222a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 5316 bytes
font_01_sfnt_off0000719c.bin
c0c30a41580d8fb8d6162ea360b7570004cbc38b7bbcc535aa27aa41fbdee56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719C 10888 bytes

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