Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d2f4d9867b6d5d…

MALICIOUS

PDF

38.4 KB Created: 2020-08-24 14:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14d0e2346805e60ed5963864070c0bae SHA-1: f352b8b8f1de22728b60f9854f0bcb1655bda008 SHA-256: 87d2f4d9867b6d5d038542c1de5d77656005632cad103c43ad4d37afad8b16a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ttraff.ru). The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is clear.

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=bailey+and+love+surgery+27th+pdf
    • http://kiwawas.thefemalescribeofgod.us/uploads/1/3/1/4/131409474/8163896.pdf
    • http://files.thelajollachiropractor.com/uploads/1/3/1/4/131438464/sodov_kavibubexup_nezuvi_megizag.pdf
    • http://kupor.theneighborsimprov.com/uploads/1/3/0/9/130968984/tokakinodevuteri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/30150899210.pdf
    • https://cdn.shopify.com/s/files/1/0440/5955/8053/files/labunipajaleral.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3480/files/best_mp4_to_avi_converter_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/20510202759.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/22506237439.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0450/7457/9608/files/gratis_whatsapp_stickers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/philips_universal_remote_codes_cl035a.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/xelasuxazikokite.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1560/files/gta_vice_city_free_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/58435485386.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_off00005767.bin
b4336df350a9d00f4b2b44fb1273060b579b16e6b44af1ff6fe9cad60f358498
pdf-font-stream PDF embedded font (sfnt) at offset 0x5767 5724 bytes
font_01_sfnt_off00006af5.bin
622562366a954aec43a10dcb9b9a248afb7efc3c82d831b44e0dce0d6006db7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 9980 bytes