Malicious PDF — malware analysis report

Static analysis result for SHA-256 770dc1cecad124d6…

MALICIOUS

PDF

32.1 KB Created: 2020-08-15 17:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 437883dd6473c33e77a78feb974145ff SHA-1: b3f045290f36cf29c64497f74eadda698474a788 SHA-256: 770dc1cecad124d6403a362a30fc054a4208b27910ea23ac74f01ce5cb862e56
194 Risk Score

Malware Insights

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

This PDF document employs a link farm and SEO redirection to lure users into downloading potentially malicious content, disguised as academic materials. The primary redirector URL is identified as malicious infrastructure. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user trust for malicious downloads.

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/wb?keyword=matlab%20for%20engineers%203rd%20edition%20solutions%20pdf In PDF document text
    • http://files.johncheck1.com/uploads/1/3/2/7/132710592/2541779.pdfIn PDF document text
    • http://files.shimsfitness.com/uploads/1/3/0/7/130776573/8096470.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/1/0443/9290/6918/files/60173794455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1786/1277/files/mizuvexibosilisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/relobonutesalosag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/99124884711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/list_of_common_idioms_and_phrases.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/gepapajotesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/american_english_file_3_2nd_edition_teacher_s_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/arabian_nights_stories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/mosib.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 2

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_off00004122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4122 5520 bytes
SHA-256: a6d19b8d9641e9219250706091f4551cb32071a1aa4b098db0380930be228a99
font_01_sfnt_off000053f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53F1 9340 bytes
SHA-256: a3b21a5927b4f7979a2fefd2f56341ca3f655a6bfcf87bd462ccfa6e9d66032f

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