Malicious PDF — malware analysis report

Static analysis result for SHA-256 4336e8c6db06bbcb…

MALICIOUS

PDF

57.2 KB Created: 2020-08-12 09:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 295092fcd075738182765da31534c809 SHA-1: c44d79e9d59dc073b97f7ae2d28dc9d84727cc9a SHA-256: 4336e8c6db06bbcbda5119f7e8c35edfe8024add6c724516b43163161fd6914a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, including a known malicious redirector at `ttraff.cc`. The heuristic `PDF_SEO_LINK_FARM` indicates a mass external PDF link farm, suggesting the document is designed to host numerous links. The ML classifier also strongly flagged this PDF as malicious. 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=les+alphabets+fran%25C3%25A7ais+majuscule+et+minuscule+pdf
    • http://files.promisegarden.com/uploads/1/3/0/7/130775698/gubejozaka-zatukeme-wifipefe-tonevadoton.pdf
    • http://files.purecbdnc.com/uploads/1/3/0/7/130738917/dojumi.pdf
    • http://noseposu.ocoldpros.org/uploads/1/3/1/3/131380600/dimaj_keferut_munixoruxinul.pdf
    • http://vimodi.finequalityrugs.com/uploads/1/3/0/8/130874493/5423383.pdf
    • http://lumuwegiv.kategrindon.com/uploads/1/3/1/3/131383949/vozugevibij.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/kivusukilukibejagebanufoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/tevunugovesosij.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/7922149004.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/embriologia_aparato_respiratorio.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8623/files/grade_distribution_iu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/5513446056.pdf
    • https://cdn.shopify.com/s/files/1/0430/4827/2023/files/67173861626.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/sanukipaso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdf
    • https://cdn.shopify.com/s/files/1/0437/1972/1115/files/8742138004.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/nitro_editor.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/chamberlain_whisper_drive_plus_manual.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_off00009b78.bin
618d15099620b3fedc02403d8cb8c785cd00ca798b5919139ae11ac35cab757f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B78 5732 bytes
font_01_sfnt_off0000ae78.bin
3e377812dc6dcbf84629c654c16688a44125d60044d5f5d796bb486ea901f49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE78 12216 bytes

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