Malicious PDF — malware analysis report

Static analysis result for SHA-256 78788d2aa8a1c25b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 13:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2e30b78abfd53d35928da5b2442a5ea0 SHA-1: 452f2c4ab53486a7555d0b18a97a03e477944367 SHA-256: 78788d2aa8a1c25b38d8a71e8d840f4984b0d5995f0d4343ee7387fc55c637fc
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a phishing or scam attempt. The primary redirector URL is `https://ttraff.com/pify?keyword=ap+calculus+bc+prep+book+pdf`, which is likely used to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, and the presence of many external links points to a link farm or redirection scheme.

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=ap+calculus+bc+prep+book+pdf In PDF document text
    • http://files.cheskasstore.net/uploads/1/3/1/4/131407042/fodomelir.pdfIn PDF document text
    • http://files.travisseaborn.com/uploads/1/3/2/6/132681492/7957007.pdfIn PDF document text
    • http://ramisoxez.fallentreeexhibitions.com/uploads/1/3/2/6/132683014/patix.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/1/0434/2064/7576/files/nakatiketomukuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/43078416576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/laselejapujebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/76201414615.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/effective_java_3rd_edition_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/ariana_grande_christmas_album.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/90953398049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1822/1728/files/xeketajipebam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/carnatic_music_book_in_malayalam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/acta_constitutiva_de_coca_cola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/lightroom_5_tutorials.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/hacking_tricks.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
🗂 Part of campaign: cheskasstore.net 3 samples

Related samples 3

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_off00006ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED4 5344 bytes
SHA-256: ecf9fea2a179c80d1d3b716ad8abb662efa0e46d57168cbfadfaaa36d7003916
font_01_sfnt_off00008101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8101 10256 bytes
SHA-256: 84937bc3e807da948bbc3ae4ccf617258bb96eccfc30171d095730fab30f954a

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