Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcadce60537b1ddf…

MALICIOUS

PDF

38.2 KB Created: 2020-07-28 22:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d770520057cc89e2865804db0e03d5ef SHA-1: d3a4ebdc72ab82c9429c770f9b81955e7fa16175 SHA-256: fcadce60537b1ddffd87637b04bd55df6574de998bade14685d1c730fea9d69f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector link pointing to 'ttraff.com'. Another critical heuristic identified it as a PDF link farm, with many links hosted on 'cdn.shopify.com'. The document body, though heavily obfuscated, contains text related to 'Junior english 4 answers', suggesting a lure to trick users into clicking the malicious links.

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=junior+english+4+answers
    • http://files.verdantmindandbody.com/uploads/1/3/0/7/130776518/4d1cd478.pdf
    • http://files.motodesigncafe.com/uploads/1/3/0/7/130775435/zinimerijises-renabolipunu-lajiwimojupur.pdf
    • http://files.mveanow.org/uploads/1/3/1/1/131164047/bugefus-bewezotavo.pdf
    • http://files.blastedriveraussies.com/uploads/1/3/1/6/131606431/e1ce05de668.pdf
    • http://files.clarkdehart.com/uploads/1/3/0/7/130776393/cc61a925a03.pdf
    • http://files.clarkdehart.com/uploads/1/3/0/7/130776393/c
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/welenofivisetipavokage.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/mewuzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/35939085485.pdf
    • https://cdn.shopify.com/s/files/1/0437/9554/6273/files/31734995977.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/jewitapadabojabugifaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/girozezolatazobizen.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5382/files/lubugokojozed.pdf
    • https://cdn.shopify.com/s/files/1/0435/7092/1635/files/jeguxewevisuxowiferop.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/junoza.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/gubixofaxozuguzoletive.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/nupopawovodet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1603/files/9894421740.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_off00005818.bin
aeafe8f8b3bbfae90f6c6c5e44b0bb957664c12abbb448c1afaf982504531ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5818 4920 bytes
font_01_sfnt_off000068d0.bin
ea86d9d17ae5b3267454c6fa6a2ab7bf07cc33690875f5fabd5fa8755a309f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 9916 bytes

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