Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c73deb31ef51721…

MALICIOUS

PDF

49.1 KB Created: 2020-08-17 17:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a93d7b3188d95b497cbeb934805a4c78 SHA-1: 84a9c862ca10c5e5a57102879e6cbc243906d5f9 SHA-256: 4c73deb31ef51721b1684521f78ee6453ef673caaa344f542486c6187ac2649d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though partially corrupted, contains text suggesting a formal request, which is likely a lure. The ML classifier strongly supports the malicious verdict.

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=formal+letter+for+request+format
    • http://files.nuggetfest.com/uploads/1/3/2/6/132695336/448f718288040d.pdf
    • http://fifeb.bridgetbuildscharacter.com/uploads/1/3/2/7/132740249/93fe207e5a.pdf
    • http://files.visiblegreenhome.com/uploads/1/3/0/8/130813762/dolapapikevaz_wepumeduja_liroz.pdf
    • http://files.paminingprofessionals.org/uploads/1/3/2/6/132695428/9898824.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/jefapumipor.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/linked_list_java.pdf
    • https://cdn.shopify.com/s/files/1/0435/2979/7787/files/gudanigopak.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/english_language_proficiency_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/divusekugolobemafozej.pdf
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/monitoring_and_evaluation_skills.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/zilufowazaboxesetub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7566/files/kusamudifonagomo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/vomixinakesuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/28661000490.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/spring_batch_tutorial_espaol.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/
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/monitoring_and_evaluatio

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082f1.bin
ad44232dc6dfcd564a92608a36b61c4a5c833312ecfae9ef2dc1f65bb7f55cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 4992 bytes
font_01_sfnt_off000093d5.bin
64e6dafbc6123a8b04d06882d4972ff8b145349952cb9dff01fb45a2076db9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D5 10304 bytes

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