Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb8aa0e1839bb2a…

MALICIOUS

PDF

46.2 KB Created: 2020-08-15 16:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb04e68a1277378c247cc578f28c30c9 SHA-1: 41d9b7f661300024140ac30413a7544704076ca8 SHA-256: afb8aa0e1839bb2ae51615e304b2db5ca44616c98d5609d11254d08251baabb8
152 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=tracheostomy+care+and+suctioning+pdf', suggesting a lure related to medical information. The presence of numerous other PDF links, including those hosted on Shopify, indicates a link farm designed to obscure the ultimate destination and potentially spread malicious content. The ML classifier 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=tracheostomy+care+and+suctioning+pdf
    • http://files.icbcmillrunpa.com/uploads/1/3/1/0/131070294/5b2404acbae9d.pdf
    • http://luwuza.castlehill-training.com/uploads/1/3/2/3/132303382/8028216.pdf
    • http://files.tonydimarcormt.com/uploads/1/3/1/4/131406732/jonojikuvirip_nevoluji_kivujiti.pdf
    • http://files.hausofv.com/uploads/1/3/1/8/131858592/rululirukidolukeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/xekokanovufutud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6599/files/aeneid_in_latin.pdf
    • https://cdn.shopify.com/s/files/1/0437/8591/2472/files/suguwopesadobulabevewago.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/lulirasofak.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/calligraphy_handwriting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/differential_calculus_derivatives_of_algebraic_functions.pdf
    • https://cdn.shopify.com/s/files/1/0447/7540/7782/files/22513254853.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/xixiwaremuvokezixuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/balancing_chemical_equations_worksheet_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0434/1419/2284/files/74842772284.pdf
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/fundamentals_of_accounting_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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006840.bin
2ea40c47584c7d4c32b6fd2f5d5420bcc2c4c7a9dcf25edd821e4c44eadb2109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6840 5472 bytes
font_01_sfnt_off00007ab4.bin
8cdf24588258759f9770e2efd99b46c1a8766bf3df90749ba62f22194393b8f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 10460 bytes
font_02_sfnt_off00009dad.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAD 4324 bytes

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