Malicious PDF — malware analysis report

Static analysis result for SHA-256 5899ac53a2c9f718…

MALICIOUS

PDF

44.5 KB Created: 2020-08-03 23:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a1fd0a4ad305ba16c31829baad6422c0 SHA-1: dfcc247a7be3181bbf42401a1f6fc6309533125b SHA-256: 5899ac53a2c9f7185f80fd7eb70921a0060891c6f7042fa6f5ff774e98a94d47
202 Risk Score

Malware Insights

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

The PDF contains a link disguised as a download for 'Afcat 2020 question paper with answer pdf'. This link redirects to a known malicious infrastructure at ttraff.ru. The document also exhibits a link farm behavior, embedding numerous external PDF links, likely for SEO manipulation or to obscure the malicious redirect. The presence of a visual download button further supports the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=afcat+2020+question+paper+with+answer+pdf In PDF document text
    • http://files.bellebookandcandle.org/uploads/1/3/1/1/131164130/8491448.pdfIn PDF document text
    • http://files.gregghenriques.com/uploads/1/3/1/0/131071157/nelawexujeb.pdfIn PDF document text
    • http://files.songsterrecords.com/uploads/1/3/1/4/131452838/1900856.pdfIn PDF document text
    • http://gudirawow.painterly.shop/uploads/1/3/1/8/131872269/zowawifom.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/1/0427/6856/4380/files/nufusawazopadedur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/94238968789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/jiluporotujarajega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4329/9232/files/46830122867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/lupozelefogevox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/80029435880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/tokutogabiganetutix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/34260412590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7768/7701/files/88846344525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/7538524176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/notezezotumigarutigog.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_off00006eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFF 5692 bytes
SHA-256: 5d6b27d3babd62cde8e3d52bd4bfe21dcc4a7d9a2398d7cf18847207f70cef59
font_01_sfnt_off00008273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8273 10072 bytes
SHA-256: 6c8689cf6fc199a1e710b090cd9218d20702b39d0337b0042172bd201bfab815

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