Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b47b7000406ed57…

MALICIOUS

PDF

39.5 KB Created: 2020-08-09 09:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b534931b4e783bb20fedc74b9100848 SHA-1: 37c587dcd7464e14f778f527228ecb4907baa32f SHA-256: 2b47b7000406ed57cca1b863a91ec03a8b2822061e0f7d068b829821d1e1affd
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, and another identified a link farm structure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The primary attack pattern involves luring users to click on these links, which likely lead to phishing pages or malware downloads.

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=ccna+version+6+pdf+espa%25C3%25B1ol
    • http://matupur.safeharborpaymentsystems.com/uploads/1/3/2/3/132303189/dilagod.pdf
    • http://files.mindfulmethow.com/uploads/1/3/0/8/130813851/9797365.pdf
    • http://files.tuscarora-tribe-nc.com/uploads/1/3/1/4/131483031/6636366.pdf
    • http://files.durhamroofing.org/uploads/1/3/1/4/131455543/c60c4335dff7e62.pdf
    • http://nijajafig.troop167arlington-treasury.org/uploads/1/3/2/3/132303382/67b1cf62.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/81012706563.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1268/files/john_deere_snow_blades.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/single_variable_calculus_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/sample_job_interview_questions_and_best_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/5493/7765/files/revoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/xirudufoberivitikerupo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/49734329830.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33971068516.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/12085867287.pdf
    • https://cdn.shopify.com/s/files/1/0430/7546/9473/files/wikazej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/libidurekatomanazavevufi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/beborix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/92589377969.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_off00005953.bin
7dde6816d74f328a0c0e40a1fa89498ba696d816d02123fe41405a91bef8cf18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5953 5480 bytes
font_01_sfnt_off00006bcb.bin
d529c8c8263e03fdfdccdd57438bbcd2c644190f8725249a56bd9bf03dd1a242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCB 10480 bytes

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