Malicious PDF — malware analysis report

Static analysis result for SHA-256 646cbcb56b5ad61b…

MALICIOUS

PDF

42.1 KB Created: 2020-08-05 16:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e365cc266648f6c5f68a30db42c18f90 SHA-1: e8dbfbab3b93bd4112d5bc0861f6bd28c89bcb9f SHA-256: 646cbcb56b5ad61b7f76d28d6bc8a59f0c10c85d13fd01d7849ad5996f54741d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector URL, `https://ttraff.cc/pify?keyword=universal+self+scorer+biology+book+pdf+download`, which is indicative of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a 'biology book download' lure, reinforcing the phishing pretext. The ML classifier also strongly flagged this PDF as malicious.

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=universal+self+scorer+biology+book+pdf+download In PDF document text
    • http://files.nnhst2.org/uploads/1/3/1/1/131164081/lebirijoga.pdfIn PDF document text
    • http://xutev.windwardcbl.org/uploads/1/3/0/7/130776791/1456614.pdfIn PDF document text
    • http://files.mjtartwork.com/uploads/1/3/1/3/131384301/pirelu-vofesobeferigif.pdfIn PDF document text
    • http://files.crookedcrown.ca/uploads/1/3/2/7/132740329/rorixiliwojajasubap.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/1/0428/0342/9535/files/41816889751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/38367258070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7958/2374/files/baixar_filmes_mp4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/bidukiwadusogori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4066/8838/files/dufozavojamusuxusiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/pcat_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/ejercicios_para_marcar_abdomen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/jaxaxonixetenevepoxiregu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/gonomakedoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/73526560146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7086/6076/files/32138254707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/85416103974.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 8

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_off00005993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5993 5772 bytes
SHA-256: 36f89becb244dc24616223c58d0b3753b1bf4c6fcb680235e005acc03ee1270c
font_01_sfnt_off00006d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D64 14756 bytes
SHA-256: c67ec333275142372f7872a28e4707872bccb7ff42ea3f8dd34338d65dd2201b

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