Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cf31cb14b3e7b8…

MALICIOUS

PDF

46.9 KB Created: 2020-08-05 17:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 92010e9190205264697b10561163fe92 SHA-1: cc35b0ca0540a19ecae4ec1bcb2b611230dfdb33 SHA-256: 43cf31cb14b3e7b85c5a1667d036515cef46b1246b1cc4c8273f64150a787e4c
194 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a URL that impersonates a free software download. The document body also contains this URL and other links, reinforcing the lure. The presence of numerous embedded links, many hosted on cdn.shopify.com, suggests a link farm designed to improve search engine ranking for malicious or unwanted content. No scripts were extracted from this sample.

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.cc/wb?keyword=dopdf%20free%20download%20for%20windows%2010 In PDF document text
    • http://files.sarahwood.com/uploads/1/3/0/8/130814101/6588006.pdfIn PDF document text
    • http://files.morocco.ency-education.com/uploads/1/3/0/7/130738806/5847bdc.pdfIn PDF document text
    • http://files.bibisnelderwaardbrion.com/uploads/1/3/1/1/131163943/gifole_kibodifegezidod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/32251794363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/71291352954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/ratolotidomikapidimiben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/zovumu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/xitunalefidesomaxomulutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3824/3996/files/anthropology_research_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3822/0181/files/97953000477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/fitapemanat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5298/2684/files/18765072991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4652/6376/files/poragozixoluvofadabigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/fimoru.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 3

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_off000062b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 5320 bytes
SHA-256: 943bae65316541c38adf9b453275ba86c8514805b03e5dd5d7be09778c606e92
font_01_sfnt_off000074ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74ED 7860 bytes
SHA-256: 36c1ebfe3ac363e18b1dbd1acf8c9f1daf4548c6cbd131357ffcdda75f6f9e38
font_02_sfnt_off00008ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB5 10304 bytes
SHA-256: 8210f48c9ddb473a8f20943f3f7939bbd0c3720c88084065da2178d6ac17c253

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