Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf028c755588be8…

MALICIOUS

PDF

50.2 KB Created: 2020-08-11 08:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0e6f2f2f827db59fbad1ba40f6cebe82 SHA-1: 25b4f750262f98d5535f255a83d15969af6a43f9 SHA-256: 4cf028c755588be81a87adb373c49e275684307322b1e6c56a6ff73d077e6a0d
202 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=nda+maths+formula+pdf+download'. The document body also contains this URL, indicating it's the primary lure. The presence of a 'download button' heuristic further supports the deceptive download 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=nda+maths+formula+pdf+download In PDF document text
    • http://files.creativeonlineservices.com/uploads/1/3/2/7/132740187/4709952.pdfIn PDF document text
    • http://files.rgmgonline.com/uploads/1/3/1/6/131637291/luwuba-jotirenikoxi-dasezilikeka.pdfIn PDF document text
    • http://nijezuv.shoprosethorn.com/uploads/1/3/1/8/131858661/868989.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/1/0433/0687/7080/files/bivunamu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9086/9410/files/7256187728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/26674244994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/2752279231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/jezitabarugefedonoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2685/6610/files/kimujamujefape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4555/1256/files/89601358955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/baby_girl_names_in_tamil_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/psychology_101_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/vokivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/lokofisorigiloserikeguti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 5344 bytes
SHA-256: 38746bc5880280bce97dd12ac796e2f80faa0db7b4f4e158fa3b2bdc19dd5f5d
font_01_sfnt_off00008ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC0 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_02_sfnt_off00009865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9865 10248 bytes
SHA-256: 591e906eb081373d2ee7a9446efdf2bd8b1ce9a5c8e9e16052d4be39cb0dd526

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