Malicious PDF — malware analysis report

Static analysis result for SHA-256 2490f72f2194f1af…

MALICIOUS

PDF

47.2 KB Created: 2020-07-29 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ca352cabc78809e00d959a8070e53961 SHA-1: 735a09f9d777a11eeb9577c53ea76227f13b991f SHA-256: 2490f72f2194f1afa728da8dc58efa16a3d7c45028b28ff9476221455fae7830
202 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The document body, though heavily obfuscated, contains text related to 'medical certificate format for job pdf', aligning with a phishing or social engineering 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.com/pify?keyword=medical+certificate+format+for+job+pdf In PDF document text
    • http://files.lennoxweb.com/uploads/1/3/0/7/130739022/biveziwovepoja.pdfIn PDF document text
    • http://files.mrsnow.org/uploads/1/3/1/8/131856919/xokofobuzesavo-jawagi-rudanami-vesajuzigerorid.pdfIn PDF document text
    • http://files.arisharding.com/uploads/1/3/2/6/132695445/javija.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/1/0427/8992/9116/files/16122062792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/74738129640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/zofepekivagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/49578842238.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/59637902597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/44195152085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/70541728054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3081/3592/files/86219799372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/tudebagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/legub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0029/9683/files/wimugojuda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/totejozevuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/93226554415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/18005900447.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 5024 bytes
SHA-256: 6af693a63fa7d32996ed9dd93bace7fb70fba407a68b4b150a966d3301e472cf
font_01_sfnt_off00008c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C70 10032 bytes
SHA-256: b392cd9d64e35464e2dc3c39c5cdf1345d3ed5ca4eaef3ce02e69f01ae3abe3d