Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b5f218297bb39f…

MALICIOUS

PDF

66.2 KB Created: 2020-08-12 04:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bcc9dbfb51362bde6920f174e0232efe SHA-1: 2d910bbe9a1060ff05a58023b1bd6231d921ace4 SHA-256: 17b5f218297bb39f5fb623a75ba3932a169ec5207940861936d406d77dc93b1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the malicious URL and other PDF links, suggesting a link farm or redirection scheme. The ML classifier also 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.cc/pify?keyword=cell+differentiation+and+specialisation+pdf In PDF document text
    • http://files.butchfriedrichsfoundation.org/uploads/1/3/1/4/131453784/bufoz.pdfIn PDF document text
    • http://files.northmenslmc.com/uploads/1/3/0/7/130739155/bozibiganil.pdfIn PDF document text
    • http://files.denvermobilehair.com/uploads/1/3/1/4/131409526/4635715.pdfIn PDF document text
    • http://files.zareenrestaurant.com/uploads/1/3/1/6/131637362/mopaxujo-fewalavam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9430/1085/files/zidubitozupubizef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/70070974259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/13140230571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7474/7558/files/placental_development.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5649/5783/files/42703578470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3699/9831/files/dejom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/quant_job_interview_questions_and_answers_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/68452842509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/tatosinikazezena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/57571250751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/belew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4483/8303/files/rojoden.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 5052 bytes
SHA-256: 7b94097bded77df13d0315e9f21179d76b79898757902fccd4c0638761d8384f
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 10456 bytes
SHA-256: 4b9444844bab7a35faf1ed2c528de9c7fbb7c368331b218712082b4a67af19c4

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