Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2900fdaf428b45…

MALICIOUS

PDF

40.4 KB Created: 2020-08-11 17:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066dfa2b79f92b6663f6b8844a049408 SHA-1: 0773c0567db4373dedfa69174577833c3a09745b SHA-256: 1a2900fdaf428b454a1199350024a9b6753a38ea1f3327ec2d345075cd3c306a
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, and one specific URL pointing to a known malicious redirector. The document body text, though heavily corrupted, contains keywords related to free downloads and the malicious redirector URL, suggesting a lure to trick users into clicking malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=data+structures+and+algorithms+pdf+free+download
    • http://files.instituteforlgbthealth.org/uploads/1/3/1/8/131871701/rowatesezama.pdf
    • http://files.spareroompdx.com/uploads/1/3/2/6/132695405/043ed160537.pdf
    • http://files.carolynmarconi.com/uploads/1/3/1/3/131384281/ketuxexemuzoga.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/exercicios_sobre_angiospermas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/38335597595.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/46954217321.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/operational_amplifiers_and_linear_integrated_circuits_6th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/42795409818.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/kapesixolokekulenowosaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0074/files/86562159717.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/vusewawufafufule.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/pisuzimofowutawimuzemokav.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/tumigififo.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_off00005eb2.bin
9e691c7b2d53dcd84f9a3551958d1aa895ad1c5f9d0ba87e2f5ffba8b756c09f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB2 5660 bytes
font_01_sfnt_off000071d8.bin
d79518e56625acc899e693c5a1f68784eb91797843f78e42df9fbcd2572244fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D8 10188 bytes

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