Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b84e0b092315e7f…

MALICIOUS

PDF

59.6 KB Created: 2020-08-25 00:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77fe652be18990fc0809048316ce737 SHA-1: cb717bc69885298cac058127c3a07f9ce441df89 SHA-256: 0b84e0b092315e7fb3cd5f5ef7d4168214b4547994c65779692fc2fc059c0e82
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to health guidelines and also embeds the malicious URL. The presence of many links suggests a link farm or SEO poisoning attempt to distribute 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.ru/pify?keyword=american+heart+association+guidelines+for+dyslipidemia
    • http://direbaka.ysk-chb.com/uploads/1/3/1/4/131406676/tamazemowesojimidal.pdf
    • http://wozofa.weirfarmartalliance.org/uploads/1/3/0/9/130969360/roxelufik_sexavalipi.pdf
    • http://xuralo.38plus2productions.com/uploads/1/3/1/3/131398177/nejuwisugobad.pdf
    • http://kawube.chevron.ie/uploads/1/3/0/7/130776021/joduvu_vubumufixaf.pdf
    • http://files.vanessaker.com/uploads/1/3/0/9/130969476/a1d7e0095a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/wobekusanukunibidasos.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/antisocial_personality_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9121/files/blame_the_night_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0449/3757/6603/files/brothers_grimm_spectaculathon.pdf
    • https://cdn.shopify.com/s/files/1/0440/1335/5166/files/aha_2020_acls_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/8292064711.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/bioterrorism_articles.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/adobe_photoshop_cs2_all_shortcut_keys.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/formatting_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/download_file_using_download_manager_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/28486848078.pdf
    • https://cdn.shopify.com/s/files/1/0434/7953/1673/files/allah_names_with_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000937a.bin
629e3a3d451879c8d8c5fc4cdd1d7e1205265b10908cc356d402ce0840cf169c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937A 5540 bytes
font_01_sfnt_off0000a620.bin
661e1c034c60b1a7d146c9621db707a8c4932c2787b141c22ac6e0c9c655bab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA620 14408 bytes
font_02_sfnt_off0000d2ec.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 4324 bytes

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