Malicious PDF — malware analysis report

Static analysis result for SHA-256 072319b946cc0e11…

MALICIOUS

PDF

51.8 KB Created: 2020-08-05 15:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4df2dc25fa3fe1071360d2ff6589b97 SHA-1: a4b4ba5fb80dfaf421c43c6c127fc90d44a670a3 SHA-256: 072319b946cc0e11233e9a1deffe91ca7f9b0980eebd0da31f7cb4fd3e45d500
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One prominent link, 'https://ttraff.cc/wb?keyword=nucleotides%20and%20nucleic%20acids%20worksheet', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The ML classifier strongly indicates maliciousness, supporting the classification of this as a phishing or redirection attempt.

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/wb?keyword=nucleotides%20and%20nucleic%20acids%20worksheet
    • http://files.alexploreonline.com/uploads/1/3/1/8/131871605/760129.pdf
    • http://files.jmoymi.com/uploads/1/3/1/4/131406518/3457486.pdf
    • http://files.yunzowfamilyfarm.net/uploads/1/3/1/3/131379343/joluremowuwuwuragexi.pdf
    • http://files.mosaicosolutions.com/uploads/1/3/0/7/130775103/rebidamipuvafo.pdf
    • http://wodej.blatherscatdesign.com/uploads/1/3/1/3/131381464/kiguni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/how_to_find_utilities_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/fallout_new_vegas_gun_runners.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/seekers_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavijado.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/kawatufawal.pdf
    • https://cdn.shopify.com/s/files/1/0436/2669/2771/files/56847606979.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/58983921220.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/43126635751.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jobevemavesofidubuxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/seeley_anatomy_and_physiology_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3507/files/favedu.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_off00008d70.bin
26620a13aa58002bcb952b3da8aa89e7decfe4b3b3cee8cd04933de7fe9b9475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D70 5152 bytes
font_01_sfnt_off00009f06.bin
75250d9bb299aa83bd2a026848528aed8c12e0fab8cc5e34c2b887ddbf0d890c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F06 10260 bytes

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