Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b90a3b2f9e550…

MALICIOUS

PDF

36.4 KB Created: 2020-08-23 04:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ec54478c24aa0d7785d93610505ac8cc SHA-1: 086c0363f1a81a72dcd02e69605e336a9adfbedf SHA-256: 8c1b90a3b2f9e5502c46b988813a601c8ab80c7ad85d01b0eac782666f2e570d
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=antenna+vtu+notes+pdf'. Additionally, it features a PDF link farm with numerous URLs, many hosted on Shopify, suggesting an attempt to obscure the malicious destination. The ML classifier strongly indicated maliciousness, and the document body, though partially corrupted, contains text related to 'Antenna vtu notes pdf' and the redirector URL, reinforcing the lure.

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.com/pify?keyword=antenna+vtu+notes+pdf In PDF document text
    • http://mokeju.eartharkbotswana.com/uploads/1/3/1/4/131483245/5513673.pdfIn PDF document text
    • http://neloxeje.asheleijohnsoncounseling.com/uploads/1/3/1/4/131454731/jagatawotuzofojupum.pdfIn PDF document text
    • http://files.visittvillems.org/uploads/1/3/2/7/132741476/fadupetisubed.pdfIn PDF document text
    • http://files.fanaticalyankee.com/uploads/1/3/2/7/132740606/b3c19b2ab67.pdfIn PDF document text
    • http://gegirezuj.rangebourne-pets.co.uk/uploads/1/3/2/7/132740228/nizabelovefizejubura.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/1/0441/2047/3752/files/96023858195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/84009652438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4204/5089/files/bixojifisom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/entourage_season_3_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/atropa_acuminata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/0019/6264/files/fafapaditusevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1848/8741/files/destination_b2_chomikuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7936/8858/files/94040844268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6060/9703/files/spread_spectrum_modulation_in_digital_communication.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/54090254669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/xokovajivuwowaruzuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/tezolizavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/92195118678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0076/6369/files/josilezaj.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5020 4956 bytes
SHA-256: 573dded0f722799847a3f89f6a505b47ba24cc95b39240160aba0ad18397f6ca
font_01_sfnt_off0000611b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 10516 bytes
SHA-256: 42b9cfbbfa9f90b229e785bfcb5629d61af77ab1e62ab8df1e3fd8a95df0e2ab