Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef33758442c8af71…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 18:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 62c4f5e59baa0140468029bb7d9b021a SHA-1: f13cd7a4c5c38942bfca5dd24cad5db3294bb40c SHA-256: ef33758442c8af713e2daf00f4aafc29f482a4d32fb24ffb347193cc1ccec784
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious PDF

The PDF contains a large number of embedded links pointing to other PDF files, constituting a link farm. One of these links directs to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. No scripts were extracted, but the structure and linked URLs suggest a malicious workflow designed to lure users to malicious sites.

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=alnor+ebt731+pdf In PDF document text
    • http://files.travelwithgenie.com/uploads/1/3/0/7/130738639/875a332b.pdfIn PDF document text
    • http://files.niloufarfarzam.com/uploads/1/3/0/8/130874369/7064865.pdfIn PDF document text
    • http://files.jennyginolson.com/uploads/1/3/1/4/131412181/butexagegutudur.pdfIn PDF document text
    • http://files.athomeinbedstuy.com/uploads/1/3/0/8/130813913/sifaf.pdfIn PDF document text
    • http://robiso.designingaccess.biz/uploads/1/3/1/0/131071164/nimafemor_pupuze_kuvikudufaru.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/1/0433/5294/8901/files/32448925919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/muxexepetapisegol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/building_materials_lecture_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/catch_the_wind_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/38956285088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7004/3813/files/dadixutikozas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1639/6697/files/sins_of_a_solar_empire_rebellion_mods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/petasatazoxakigakefunuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/remove_submodule_git.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/84867541218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/77382583202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/dopig.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_off00005738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5738 5072 bytes
SHA-256: ec46375b6b8a6a32721bda759ea2f95da8ddf4a1ce30efc74f2ee1599a9d3196
font_01_sfnt_off00006899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6899 10332 bytes
SHA-256: 67e0e2a9c898a902eca5f3c4b8baec89ffd17971a7692e509911dbb095c3a243