Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ff1dbc4e0034df…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 10:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f644838fb4a4f89cc3c8e7416761748 SHA-1: e3efbf74551e4bb3cc5123448c7df666af8c8086 SHA-256: 56ff1dbc4e0034dff6e31ea70fa28cb31fb40e5064df5b7cd6c9e512dd4f591c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, with the primary link pointing to a redirector service. This suggests a phishing or malicious content delivery attempt, where the redirector is used to obscure the final destination. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports 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.com/pify?keyword=android+studio+bitmap+save+to+file
    • http://files.austindebateworkshop.com/uploads/1/3/2/7/132711999/42f684679e1b84.pdf
    • http://tilot.hansroegelearchitect.com/uploads/1/3/1/3/131381428/jofegemofefi_lokijil_sisarumujomo.pdf
    • http://files.ponywagondays.com/uploads/1/3/0/7/130775252/42af0e92c8f716.pdf
    • http://files.roosense.com/uploads/1/3/1/4/131438202/tugitatipigedof_tunini_gujoxi.pdf
    • http://files.the-trump-timeline.com/uploads/1/3/1/1/131164250/3adeb9d573dd7.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/filewefomisofakojefemuzak.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/fortnite_season_4_week_5_challenges_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jojanasesejunuveko.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/moxuwexuwisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/90692720741.pdf
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/44193435809.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9991/files/kifigej.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/alfabeto_hebreo_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/81431929714.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/fozisid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/44364684782.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/accounting_journal_entry_rules.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_off000060c3.bin
a8f8a14f49cc1b9bd9485b0378853e66519f37f8159371febddb9aadf7550be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 5376 bytes
font_01_sfnt_off000072f3.bin
8e12600cebd6659aab555ac9c0316bf8b51ef6f2caecd31868168a2d6617f445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F3 15044 bytes

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