Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a6903de0cceb1b…

MALICIOUS

PDF

46.9 KB Created: 2020-08-13 06:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c5b2988d83e940917558816006f79c4 SHA-1: eeb3153b5ad25120b0adcc7eb1c4e0beaf7a728a SHA-256: 67a6903de0cceb1be0180b407ba2f65f5a248454cb1a504b5ce90016079796e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to potentially malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is a redirector designed to lead users to further malicious content.

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.com/pify?keyword=pradeep+biology+class+9+pdf
    • http://files.parkhillbowlingclub.com/uploads/1/3/2/8/132815154/4047543.pdf
    • http://kosuk.taylorspersonalcarehome.com/uploads/1/3/0/7/130739415/b66ee1.pdf
    • http://files.davidprossow.com/uploads/1/3/0/9/130969604/ramobimevafelo-jipom.pdf
    • http://bosoje.newsforbusiness.com.au/uploads/1/3/0/7/130776394/runegonuxub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2920/6952/files/complex_algebraic_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/cambridge_checkpoint_past_papers_science.pdf
    • https://cdn.shopify.com/s/files/1/0432/9770/2046/files/safolinadetelasufapaki.pdf
    • https://cdn.shopify.com/s/files/1/0438/9529/2059/files/printable_blank_map_of_asia.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/practical_kabbalah_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0435/7134/7619/files/1163506113.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/closer_to_god.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/16973505673.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/tesulorora.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/viwukavoju.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/28967252665.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/amtrak_wolverine_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/vasone.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000741d.bin
2f255d5ccd935df05054f7d6be5113d4a0d37d7494ccd6aca2482d85968839f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 5724 bytes
font_01_sfnt_off00008796.bin
cb1ac15a3a63a2413a5804c1058b32e29507883662b3bd9d2bd037c9bc7200ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8796 11720 bytes

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