Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b798178d21d5fb8…

MALICIOUS

PDF

123.4 KB Created: 2020-08-10 05:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ad7a6973ab1f1b73c30fdb8e194ec8fe SHA-1: e2e8adbc2806f3d3438560efeb39e9023016beaf SHA-256: 4b798178d21d5fb8ea24d54cc0160298914fa1ca498cc525003f18ac02085116
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, characteristic of a PDF link farm, with the primary malicious URL being ttraff.ru. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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.ru/pify?keyword=challenger+deep+pdf+free In PDF document text
    • http://files.renewfurnitureonline.com/uploads/1/3/1/4/131409200/f2244db1.pdfIn PDF document text
    • http://files.gvtrail.com/uploads/1/3/0/8/130814177/01f9095822.pdfIn PDF document text
    • http://files.blissofne.com/uploads/1/3/2/6/132681931/6370523.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/1/0427/7318/4678/files/bofigetolopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5181/0969/files/10520224581.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/nowadenuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/vokunebakojodefilusasef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/manejo_amigdalitis_bacteriana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/4750802283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/asthma_medications_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/pefedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/walivifedugolazigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/zeguwele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/92445909077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/law_of_attraction_the_secret_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9177/7952/files/upadhyay_and_nath_biophysical_chemistry_free_download.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 5

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_off0001a6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BF 5028 bytes
SHA-256: 756f53fd844e54745dfea063ce6be01048a80a8b446a679aae34a1692ed29870
font_01_sfnt_off0001b7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D1 11940 bytes
SHA-256: f87defed9b526b4f4567663e2229257b278887b3870872253f675b05d879dc51

Open this report in the interactive analyzer, or submit your own file for analysis.