Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f4492ad9b3b9d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-16 22:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4504e8a0c1a34336fff9c843f03bd352 SHA-1: 425a0d1fe59903b56a2ad7def3dfa4fff113e41a SHA-256: 828f4492ad9b3b9d07728d14388ff35827d5acc662ed820fb27b7f8d1f410beb
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 (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains the same lure text and URLs, suggesting an attempt to disguise malicious links as a worksheet. The ML classifier strongly indicates maliciousness, and the presence of multiple external links points to a link farm or redirection strategy.

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=converting+units+of+mass+worksheet In PDF document text
    • http://files.abridgedinvesting.com/uploads/1/3/0/7/130740138/6296899.pdfIn PDF document text
    • http://files.beyondtolerancewichita.org/uploads/1/3/0/8/130813769/7068502.pdfIn PDF document text
    • http://files.acds-clsa.com/uploads/1/3/1/3/131379443/sotoges.pdfIn PDF document text
    • http://files.thediplip.com/uploads/1/3/0/9/130969874/4647438.pdfIn PDF document text
    • http://files.beckywidschwenter.com/uploads/1/3/0/7/130739063/lebulefidojom_duzozufigef.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/1/0435/2229/3920/files/56928619782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/18561829655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1013/8017/files/gubobowov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/41978302930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/tasasexiduguriduvulisan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/synapse_rc7_custom_ui.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/kufume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/dutupuronesurel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/39099052331.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 7

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_off0000655e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 5268 bytes
SHA-256: 3c785f70c2a5934b1efae09946d4c5c62f80369cd98325d103f81ba6c300889a
font_01_sfnt_off0000773b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 10348 bytes
SHA-256: 8418a0dcd284781f3a636791f5b79edfae67845fea9dac9e5a86a4ad7c84dcdb

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