Malicious PDF — malware analysis report

Static analysis result for SHA-256 1066b41b4fd1d33a…

MALICIOUS

PDF

35.8 KB Created: 2020-08-08 21:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 92a8540718c59d3e1a3656a6a45936fd SHA-1: c993b6b1ae503ad4a4e19cb04233b4419070b043 SHA-256: 1066b41b4fd1d33aa61a44df2ed711856e6295b2d3938122eee2a3a57cd474ec
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many of which point to a redirector service known for malicious activity. The document body and embedded links suggest a phishing attempt disguised as a free book download, aiming to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=arihant+encyclopedia+of+general+science+book+pdf In PDF document text
    • http://files.31quotes.com/uploads/1/3/1/0/131070619/menuzuwo.pdfIn PDF document text
    • http://files.lvmphotoshuntingtonwv.com/uploads/1/3/1/3/131398133/difiru_fizanuza_bazixigaveba.pdfIn PDF document text
    • http://files.tinytownllc.com/uploads/1/3/1/1/131163492/5720250.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/1/0434/3490/1671/files/ubuntu_shut_down.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/8375347409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2821/5968/files/business_english_books_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4786/1928/files/rifigowobatokon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5536/3734/files/free_basic_bodice_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/50024421846.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/32463825497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/93942637257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6738/3713/files/six_flags_over_texas_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/xutiwubeparajutenisug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/5655342512.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 7

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_off00004da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA2 5712 bytes
SHA-256: 850c37c059faae2dfa384de5c19acbb3842a538d921430745fe1213bf696a2cb
font_01_sfnt_off00006116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 9804 bytes
SHA-256: 152788593ed8ee8bf05b61ef126ca7c94b147bd2b28d1c8d470e6f25053b5640

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