Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf4c611214b55a2…

MALICIOUS

PDF

68.1 KB Created: 2020-08-04 00:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: aa772c00c68e6e033391e81f34dc0319 SHA-1: 96ce8c4423775263aa452955a16a3c4703d6f8c3 SHA-256: cbf4c611214b55a2fd4e41ae35343d6cafd2fa3273fd0117611e8d6a3f4ae997
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.ru/pify?keyword=substitution+and+ellipsis+exercises+pdf', is designed to lure users into clicking by appearing as an academic resource. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link-farming or redirection-based attack. No scripts were extracted from this sample.

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=substitution+and+ellipsis+exercises+pdf In PDF document text
    • http://files.rohinibc.com/uploads/1/3/2/6/132681343/sawodorazumorup.pdfIn PDF document text
    • http://rukubared.spiranto.com/uploads/1/3/0/9/130969772/vamibog_tezani_nogikoxoxorokur.pdfIn PDF document text
    • http://files.massagetherapyvt.com/uploads/1/3/1/4/131406811/8f943c48e73.pdfIn PDF document text
    • http://files.acaringcommunity.com/uploads/1/3/0/7/130776655/vazapis_lasilev_gexasapujuf.pdfIn PDF document text
    • http://files.nacinformation.com/uploads/1/3/1/3/131398250/xupisujiloxuvi-dusadibitiwiv-rikabuk.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/1/0433/0687/7080/files/lekutaxawiwasutoxojopelor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/85152381138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/50361150172.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2393/9237/files/51670319319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4863/8363/files/44086979232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6208/3232/files/sazexetimenujawot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/21896798968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/7733521531.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/tokafowojosekolupubukade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/muxitagedanizogotus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/vojuratetimapajenuj.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

Related samples 6

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_off0000c443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 5460 bytes
SHA-256: 06737331b2d522b0127a6210849cc7b39d0768340c588bde07cb6d07ebea6715
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 14068 bytes
SHA-256: 4fed33efc1732af58de7e1c7a5d20713f54e0ca2309a2389f36e772a6f49bd76

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