Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d396d770c6cf3b…

MALICIOUS

PDF

35.0 KB Created: 2020-08-11 18:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a7caefc4e5c0dd0d109a61cddfef3c84 SHA-1: 4ead1baa98b28cbe3aa0573c2661f53a950b2293 SHA-256: a4d396d770c6cf3bde0d7984a55b739c46c4ab9107932b1e5d4293af0ef69337
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this document.

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=calculus+1+with+precalculus+pdf In PDF document text
    • http://files.rethanksaz.com/uploads/1/3/1/8/131856646/xidebuxani.pdfIn PDF document text
    • http://kekaz.janaetabony.com/uploads/1/3/1/4/131407164/nominom_lopolawiz_jitif.pdfIn PDF document text
    • http://dugawudet.hartmangardens.net/uploads/1/3/1/4/131453574/4648288.pdfIn PDF document text
    • http://files.genesisoutdoorservices.com/uploads/1/3/2/6/132681026/samipate.pdfIn PDF document text
    • http://zokig.saintgabriels.org/uploads/1/3/1/8/131871674/225541.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/1/0427/5847/1846/files/favasiravujepakuwoxevenus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4794/2304/files/free_online_poker_games_with_fake_money.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/bevuxogibazukerilimadabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/51937294860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5430/0312/files/gedegorukojabajipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/pijibupuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/25070363958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/jufubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/eye_of_the_world.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5384/0534/files/fisetawexizotagip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/genetically_modified_organisms_journal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6385/9610/files/mass_rmv_accident_report.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_off00004c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2C 5292 bytes
SHA-256: 7182946dec3b9b3a4e4ae9b9b038f4a2af28ead16a98624c5541a3a0cdacfbad
font_01_sfnt_off00005e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E38 9804 bytes
SHA-256: 8fcf26117e154ce0c503c5a112ef8a44a814043a3ddc205c4e74510810b55afc

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