Malicious PDF — malware analysis report

Static analysis result for SHA-256 13860e9f1e7c1c88…

MALICIOUS

PDF

46.5 KB Created: 2020-08-13 23:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b192bc28993e0cc709fef728a85f893c SHA-1: 99d0485dc86d1ef0fface4294e50224db87802b5 SHA-256: 13860e9f1e7c1c8856ca1bcc37239c36d0d4c5e31fb09c8b6e078c988b86c1b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure related to certification exam answers. This suggests the PDF is designed to trick users into clicking malicious links, likely leading to further compromise.

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=hubspot+sales+software+certification+exam+answers+2019
    • http://buzetojut.teresamummert.com/uploads/1/3/1/3/131382274/1706775.pdf
    • http://zajanu.benefitplans.org/uploads/1/3/1/4/131411150/pigiwumifasofa_pafojini.pdf
    • http://dozone.innovativesheets.com/uploads/1/3/0/7/130738848/a87b877.pdf
    • http://files.finalfinishdetailing.com/uploads/1/3/2/7/132710655/levin_linebedanelu_vidaki_vukadidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/tumosikelozagarame.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/12685810005.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5025/files/turapuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8506/files/1925953076.pdf
    • https://cdn.shopify.com/s/files/1/0452/0253/8647/files/weguxuxibatawudada.pdf
    • https://cdn.shopify.com/s/files/1/0430/6432/8345/files/aithihyamala_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/45474406482.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/boiler_water_testing.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/22142951173.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/rilixuvajonanore.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/91888770278.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/13434925604.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.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_off00007582.bin
7afa7e0a8d57cb30b002236143b3f7d3a0660eb6fe9ad92c74a1a8cbd0ed029e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7582 5904 bytes
font_01_sfnt_off00008990.bin
8a12df941b4f428a061e7f2bd50a396cf1fdec92c524187a71e6ae3190b0e43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8990 10448 bytes

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