Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4b73309f188a21…

MALICIOUS

PDF

51.0 KB Created: 2020-08-11 07:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bd1d5703cb968b301b7073dc112f37ca SHA-1: 45ab80db4a51bb5840f14dd03204dc1de649ec90 SHA-256: 1c4b73309f188a21076abaf1fc3093be1c9d87b42e16ffdc4b560fd252616950
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with keywords related to financial documents. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=banking+services+chronicle+magazine+november+2020+pdf In PDF document text
    • http://files.skyfootgoddess.com/uploads/1/3/1/4/131406806/329971.pdfIn PDF document text
    • http://files.connectingcoffee.com/uploads/1/3/1/1/131164372/53921add2c9.pdfIn PDF document text
    • http://files.oakstreetnurseryschool.com/uploads/1/3/1/0/131070561/bijazexojelajojuwaji.pdfIn PDF document text
    • http://files.scotthanberry.com/uploads/1/3/0/7/130740008/5c6f034f07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/72688845386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/pokemon_yellow_gameshark_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/basic_mechanical_drawing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/34850838338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/20147547551.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/94850133078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/frame_of_reference_physics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/damekos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/khng_m_c_file_trong_outlook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/totovujowisumadape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0829/4044/files/lonaluzulukarixexawepimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/57578927695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6148/5471/files/fipujijujusev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/12612636101.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
🗂 Part of campaign: baybat-edtech.com 4 samples

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 6204 bytes
SHA-256: cbec08d5aec2c7374d69894ad9946ee7fd94697917364fc42c1904212dec687a
font_01_sfnt_off00009b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B27 10688 bytes
SHA-256: 68232ca50ead6c87f59255e8e1c849e0f3d7038079e73288f24863e2304eb2ee

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