Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8f9695b4a9a29f…

MALICIOUS

PDF

69.8 KB Created: 2020-08-08 14:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d25f5f9f8b65304c238e6172d8dc78 SHA-1: 3cb729700c0a2f047dbda1c777dcf85b30255a63 SHA-256: 4b8f9695b4a9a29fa3a241686fec89c2a2f0cbc932fe20a9a263a7b53c6ef1b7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=file+pdf+iphone+6'. This indicates an attempt to direct the user to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the lure.

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.cc/pify?keyword=file+pdf+iphone+6
    • http://files.its-true.org/uploads/1/3/0/7/130776601/1949347.pdf
    • http://files.elizabethdoylecarey.com/uploads/1/3/0/7/130776592/4511002.pdf
    • http://files.tomsfordcollection.com/uploads/1/3/0/7/130740200/litabozad-vabixoku.pdf
    • http://files.pulpfictionfuturefood.com/uploads/1/3/2/6/132681985/zaxulejidu.pdf
    • http://files.bodyvolvefitness.com/uploads/1/3/1/4/131437308/0efe234a78.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/tepagosoxifuvaxivawabena.pdf
    • https://cdn.shopify.com/s/files/1/0429/6291/1391/files/zavedolaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/jolly_phonics_sounds_flashcards.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9878/files/maxinoku.pdf
    • https://cdn.shopify.com/s/files/1/0434/2582/4929/files/game_bar_wont_open.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/kotor_2_robes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/34253076905.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/waziwoxudapudojujuwedet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/acgih_tlv_2020_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/pevebovawozar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/assemble_nationale_rdc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.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/
    • https://cdn.shopify.com/s/files/1/0437/9171/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccde.bin
8f1f827fcac3d2cc45f0b562ad77a5b5b1315e548d18c81682105c6465cb40e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 4756 bytes
font_01_sfnt_off0000dd16.bin
7b6bee7f40134f884f787f6e37aedd04d831c9f9b34f6a064026410df3dccea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 14364 bytes

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