Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a5f50f2ad23764…

MALICIOUS

PDF

39.2 KB Created: 2020-10-01 07:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2bc7934deda23e0b98ec266fc705ffdf SHA-1: fc3d8fb43186bd73f301b68be6a91f392d83a1ee SHA-256: f7a5f50f2ad2376423f08cf0e7a5dd03eab34ca33c827ab8d8724e86ccb1189a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though garbled, contains text related to a 'used car bill of sale', suggesting a lure to trick the user into clicking the malicious link. The ML classifier also strongly indicated maliciousness, supporting the presence of a payment redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=nc+used+car+bill+of+sale+pdf In PDF document text
    • http://files.mywstudiospa.com/uploads/1/3/0/7/130740297/dd1e8d13f1.pdfIn PDF document text
    • http://files.stpaulelca.org/uploads/1/3/1/4/131410685/rinozewez.pdfIn PDF document text
    • http://files.filipemiguelart.com/uploads/1/3/2/6/132682862/7659918.pdfIn PDF document text
    • https://site-1038553.mozfiles.com/files/1038553/58923459747.pdfIn PDF document text
    • https://site-1037207.mozfiles.com/files/1037207/jinibuvuvuxumo.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/21012299307.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/sakewizugakedapuzapebix.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/63393764061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3136/3747/files/idle_miner_tycoon_manager_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/callidae_voces.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/sharebutton._to_google_analytics.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 5256 bytes
SHA-256: 5cdaa7e18d76542eef5bc5e1cd5ecb21d4ca0071769499f5baef4fd511078839
font_01_sfnt_off00006e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 9840 bytes
SHA-256: 5bcebe2d86e8a986ba097ba380fca8c592e93f84adce9091f8d430c692f67203

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