Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f495c10ec2ff880…

MALICIOUS

PDF

38.4 KB Created: 2020-09-22 01:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc8fd44062ed9969086e08ed73cfb0b SHA-1: cc63d43c2e0ed9a874f9272a0e7b46c88031d643 SHA-256: 4f495c10ec2ff88031b45bf3207bd359f2d6d9425913c8f373d5d430f1b80a10
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm of other PDFs. The primary malicious link is https://ttraff.link/wix?keyword=lord+of+the+flies+allegory+worksheet, which is designed to lure users into clicking further links. The document body, though heavily obfuscated, contains references to the worksheet and the malicious URL, reinforcing the social engineering aspect.

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.link/wix?keyword=lord+of+the+flies+allegory+worksheet
    • https://cdn.shopify.com/s/files/1/0437/1133/2507/files/eleonora_edgar_allan_poe_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/rajubojesutakiko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2821/files/download_john_wick_2_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0429/8516/0857/files/mipulufewizavol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/paguxizulosuzimanomowip.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/xujimif.pdf
    • https://cdn.shopify.com/s/files/1/0440/6994/5509/files/hot_air_balloon_birthday_invitation_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1287/files/88124195016.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/hori_rap_4_kai.pdf
    • https://cdn.shopify.com/s/files/1/0435/6925/0463/files/call_of_duty_game_app.pdf
    • https://cdn.shopify.com/s/files/1/0438/1917/2000/files/engagement_announcement_card_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/hyper_light_drifter_wiki_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/grab_them_by_the_eyes_game.pdf
    • https://cdn.shopify.com/s/files/1/0431/4660/8794/files/93300679272.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0314/files/ipcc_climate_change_2007_synthesis_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/fofipakiniv.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_off000057db.bin
b82621f7e809225ab1c861029fcda563f68ff5a6170339f6e8a9991319099dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DB 5368 bytes
font_01_sfnt_off00006a35.bin
99752549d228535fe6f835d983e5117184f6e2d384d5854934e4e8d46d33f2fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A35 10192 bytes

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