Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adf1bd7c3e56c52…

MALICIOUS

PDF

43.1 KB Created: 2020-08-21 15:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 398b867d65e5a85757d39bed256d462a SHA-1: 6a5431bfbb0fa070de78498ce8c82050c98a58c3 SHA-256: 4adf1bd7c3e56c5244bd6b609c1a4391f994055609b9b60e84b8fd08786be26e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including links to known redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO manipulation. The presence of a 'download' button lure further supports the phishing pretext. The primary redirector URL is https://ttraff.ru/pify?keyword=past+simple+exercises+irregular+verbs+worksheet+pdf, which is used to funnel users to other PDF files.

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=past+simple+exercises+irregular+verbs+worksheet+pdf In PDF document text
    • http://jiweb.icater2youtravel.com/uploads/1/3/1/8/131856158/5dd64e069.pdfIn PDF document text
    • http://files.camera1.ca/uploads/1/3/1/3/131380413/pizixejawij.pdfIn PDF document text
    • http://puzegoti.theprefabsproutproject.com/uploads/1/3/1/6/131607095/gaxidebojamul-xesuzi.pdfIn PDF document text
    • http://sidife.tripleplaysportsplex.com/uploads/1/3/0/7/130776433/59d1500c5.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/1/0435/5158/8507/files/bufon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/vibujamaxogimigupini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/63554196111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4384/0412/files/25811208540.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/xipasodejomamigoboduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/fikalavewemufamimadux.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F50 5996 bytes
SHA-256: 3263adb7eb488b37e147f8625e41d7f87d4c9699986793b5afdf06296d7dfab1
font_01_sfnt_off000063a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 12188 bytes
SHA-256: 1c1e83270aa64947dffb4ab1dc2ca9fc2ad9bc7a11a4dec6a91a8b0df8dff38a
font_02_sfnt_off00008a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4E 16060 bytes
SHA-256: 9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a