Malicious PDF — malware analysis report

Static analysis result for SHA-256 7251c19ac169c29b…

MALICIOUS

PDF

50.2 KB Created: 2020-08-02 04:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f301681d25fa214ae50a05cbeab218ce SHA-1: 1c16d4a9456da58635ed7d1cb3806231a41fda14 SHA-256: 7251c19ac169c29b9e1a6bfe9c9c5249f2c8be135893d872dadd6a8d7004406c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to what appears to be a link farm designed to mimic academic resources. One prominent link directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

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=mcquarrie+general+chemistry+solutions
    • http://files.ginandtarnish.com/uploads/1/3/1/6/131606059/tirasono.pdf
    • http://files.subnum.org/uploads/1/3/0/7/130776208/sudidojakadefi_zufuvok_sudux.pdf
    • http://files.forummigrationandpeace.org/uploads/1/3/1/4/131438228/1957058.pdf
    • http://files.annayatesk8.com/uploads/1/3/1/4/131453022/mezitojuwox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jerozex.pdf
    • https://cdn.shopify.com/s/files/1/0429/3092/9827/files/29667215023.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/management_information_systems_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/kanepisemozufofedewiputub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4154/files/bipiwun.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/fadakukujitidafufulir.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1895/files/19761563056.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/gadusino.pdf
    • https://cdn.shopify.com/s/files/1/0435/3117/4039/files/embedded_on_http_docs._google._com.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavatorumagenikezelun.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8920/files/rewuferojosuginiributezor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/how_to_keep_photoshop_cc_trial_forever.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000828d.bin
3e1566c6bc1fef8e64c9ddeb057a4448bf42b6a72b6ad7d19f4c0dca15689be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x828D 5448 bytes
font_01_sfnt_off000094fc.bin
6893a8389476b6ed97c4eb5d62c010041060dd89eae17aba7310f31c8d170333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FC 12000 bytes

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