Malicious PDF — malware analysis report

Static analysis result for SHA-256 a260095d7ae0f766…

MALICIOUS

PDF

47.2 KB Created: 2020-10-29 16:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c05305bed95afecae9645e7ff46cadf3 SHA-1: 34916c2946caadb34ee98d699a9785b322c00846 SHA-256: a260095d7ae0f766fd2c71eb723723c3519e0b32214b9e21582ce2380935094f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by multiple heuristic firings and the ML classifier. The document body, though heavily obfuscated, contains the URL and text suggesting a lure for a document titled 'Playing to win pdf sirlin'. No scripts were extracted, but the presence of a malicious redirector URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.club/123?keyword=playing+to+win+pdf+sirlin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f93a3ac0f266.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/1/0495/9813/6472/files/conscious_sedation_guidelines_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a45cff-acf3-4d88-acc6-53660fadef31/28455761773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/target_market_journal_articles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c7efe4-a8e7-4368-a3ad-cc1d039f798e/35193067767.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/nerf_gun_retaliator_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0713a38a-07d9-4234-9344-2ddf69098412/poemas_muy_cortos_para_niC3B1os.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9507/2674/files/acestream_media_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa767c5-2d59-4cd9-8d72-8e3239758dfb/city_of_phoenix_bulk_trash_items.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6744/9239/files/89058134847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e269431-1a66-497e-952c-0165bd17e3ba/98256092104.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/smite_minecraft_enchantment.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_off00007a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A91 5404 bytes
SHA-256: ef170b4f120e604054977da677afe52c72144f3b73613bec686d2e91aaf74dc6
font_01_sfnt_off00008d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D21 10300 bytes
SHA-256: d4e69a03dfaa6d0ed115e0478f6efb1f4c32eb70ffa585316b444368c2797fba

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