Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c9ac049f0285f1…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 03:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 035c1a260e88271f27c636b301ccfb55 SHA-1: 1988fae24e799092455eb8372d604cc2343229e8 SHA-256: c7c9ac049f0285f1f556fb3aae726bfe364eceaca12f852fe57f07318e096c44
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to 'ttraff.ru', disguised as free book downloads. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on the malicious redirector URL, likely leading to further compromise.

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=anatomy+and+physiology+book+pdf+openstax In PDF document text
    • http://files.flutefest.org/uploads/1/3/0/7/130739444/367cd159ec.pdfIn PDF document text
    • http://kizufuvot.laura-walters.com/uploads/1/3/1/6/131606490/lokulinuveguw.pdfIn PDF document text
    • http://files.aitosaudio.com/uploads/1/3/2/6/132681901/nisajewosoxalal.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/1/0428/6231/3631/files/nobat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/25452438988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/soxaroxapafumodekif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/pazuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/github_clone_ssh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/lidujofodabogonibikodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/wuwilavafutasijow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/rimurenibopuxufulape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8507/8434/files/oxford_discover_1_student_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/dictionary_english_to_urdu_free_download_full_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/55794575989.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 1

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_off0000642c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 5720 bytes
SHA-256: d3a4d97319aac5f24426c5f2ec2bd01c0745c8818aa24bfdb3c5f6edccec9092
font_01_sfnt_off00007792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7792 10488 bytes
SHA-256: 86c4afb61fa6bd20fa013983d0502c23fe5f70ba126e447f68b67e73f9e7d2a8

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