Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d0c1cc3ff99c88…

MALICIOUS

PDF

40.3 KB Created: 2020-10-29 15:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d38691ab39d1b9df6e3bfb154f2ff5 SHA-1: 5ea482a072b0fceb82a1c24508bfc63119364c9b SHA-256: b9d0c1cc3ff99c88671c9a7a6252979928762f9efa7566e6f804adda4b8003ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'latent learning' and includes the malicious URL, suggesting a lure to a malicious site. 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://ggtraff.ru/aws?keyword=latent+learning+example+biology
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/9d0620f650526.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/mitadit.pdf
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/tigolopaxowobavedub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wexoteluwag/56967723558.pdf
    • https://uploads.strikinglycdn.com/files/bb097289-d0a5-4252-b3c1-123c6a1e0f0d/gipunogati.pdf
    • https://s3.amazonaws.com/mijedusovineti/39358449006.pdf
    • https://s3.amazonaws.com/jadudusujuje/january_2019_calendar_with_holidays_india.pdf
    • https://s3.amazonaws.com/tekujel/69153165622.pdf
    • https://uploads.strikinglycdn.com/files/eac17113-0d23-4dcd-82e6-346f47fc6ac1/ejercicios_de_sucesiones_numericas_p.pdf
    • https://s3.amazonaws.com/xanebavifamopez/38473509656.pdf
    • https://s3.amazonaws.com/vavabi/statistics_class_11.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_off000062ac.bin
7571100a4a81ede3a3bab14cca891a579c9c27ea30e5f22120d3fa2fa651fe49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 5212 bytes
font_01_sfnt_off0000745e.bin
0c27541b8e1b5ffaa16621fd3bf8b4b21818390596a209477fccd3efadedd792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745E 9556 bytes

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