Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a22478ec3e380cb…

MALICIOUS

PDF

44.4 KB Created: 2020-07-30 01:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c24cc03f3182b164b88472a82b796d51 SHA-1: 69186ea2f587ae56e67e903595c10968e9fab681 SHA-256: 1a22478ec3e380cbc741df3793b2b545a4e8ef084f872642b8d371332c93a188
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious sites. The primary redirector URL is https://ttraff.ru/pify?keyword=classroom+rules+list+pdf. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a tactic to drive traffic to potentially harmful content.

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=classroom+rules+list+pdf In PDF document text
    • http://files.mnallergy.com/uploads/1/3/0/7/130776447/sipisofaki_luwuw.pdfIn PDF document text
    • http://files.cheapskatesclub.net/uploads/1/3/1/3/131398221/1786115.pdfIn PDF document text
    • http://files.mysoapkrush.com/uploads/1/3/2/3/132302987/gosenov.pdfIn PDF document text
    • http://files.jennkarrasdesigns.com/uploads/1/3/1/4/131437225/1682746.pdfIn PDF document text
    • http://files.carolgrice-curran.com/uploads/1/3/1/8/131871414/xijugonaru.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/1/0431/3110/9538/files/78559103054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/sapudalolubosekujuvum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/22317788356.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/zejorepobilugixazomak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/83219761852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8717/4557/files/kidogoxepiwobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/fazagidonezakaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/vukebapunimapusejajuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.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_off0000703c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703C 4988 bytes
SHA-256: 448518a923662dbcd4bafc5487211178103f5d83ab51252f1e7b400336f362d2
font_01_sfnt_off00008136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8136 10652 bytes
SHA-256: 4f57ac32324978303bb09aa2125b09144dd5c19fd7c997af349ebaa6598275a8

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