Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2f83436fa83d84…

MALICIOUS

PDF

35.8 KB Created: 2020-08-12 15:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db70a53b4edd421b0461d895d341a7c0 SHA-1: e5cbe9b5548d726e01dab25004f2a7a3d530bd93 SHA-256: 4c2f83436fa83d84543368539035b498202bba5ed5bb70f1fc2cc1284fbead5f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector: https://ttraff.ru/pify?keyword=anthony+robbins+books+pdf+free. This URL is likely used to funnel victims to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous links pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=anthony+robbins+books+pdf+free
    • http://files.deansvillehorseshoeclub.com/uploads/1/3/0/8/130815277/kitojuz.pdf
    • http://files.artlaws.com/uploads/1/3/1/6/131606128/diruzujeluwonade.pdf
    • http://files.custerfccla.com/uploads/1/3/0/7/130776487/996527.pdf
    • http://sofer.bethbjohnsphotoart.com/uploads/1/3/0/8/130813747/2657759.pdf
    • https://cdn.shopify.com/s/files/1/0433/4967/2091/files/importance_of_effective_communication_in_healthcare.pdf
    • https://cdn.shopify.com/s/files/1/0434/7147/0742/files/munopivedu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/soposon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/plies_shawty_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/sufuxepur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/piwomalivunirekizirugefuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/dynamic_bones_vrchat.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/sejarah_agama_yahudi_abdul_somad_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/29577142980.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/dimijoneruxumukawapil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/gibekipobuzuzenuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/rexuxitavivawopim.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_off00004e77.bin
1e442ef9a4868ce2d45ad9040566d48f095223aaf6ad39b8f62c42b79fc023e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E77 5180 bytes
font_01_sfnt_off00006015.bin
d6b647e29f0e67516afbffdb1b232f6c69af1b2cab1abc873ddecaf85f908182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 9980 bytes

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