Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac5a6fa0d4427f7…

MALICIOUS

PDF

47.4 KB Created: 2020-07-25 16:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e0428484b984df42007a08deb438b7e8 SHA-1: caaebe443282a07ac9176f28f34cdc63def986a2 SHA-256: 2ac5a6fa0d4427f7a79c911acee2be68843e4dac1eca7db2f80f5a14361f9f06
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a download for an Android OS APK. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK directly indicates this malicious intent. The PDF also features a large number of external links, suggesting a link farm or SEO poisoning tactic to increase visibility. 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/pify?keyword=cobalt.+blackberry.+android+os-+v1.+2.+apk In PDF document text
    • http://files.windermerepsychologycentre.net/uploads/1/3/2/8/132815828/23a0a72f278.pdfIn PDF document text
    • http://files.monroeyouthcommission.org/uploads/1/3/2/6/132682813/d0a50b2f20218a2.pdfIn PDF document text
    • http://files.whimsyforest.com/uploads/1/3/0/7/130739886/wixitaguguvop_zatesip_rorekedej_mimovu.pdfIn PDF document text
    • http://files.theperfectrockingchair.com/uploads/1/3/0/7/130775292/visepusarameru.pdfIn PDF document text
    • http://files.ltjeducation.com/uploads/1/3/0/7/130740044/lonilije.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/1/0428/9835/8432/files/lufixupiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1935/1710/files/zuzugobar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/voripiwifududakuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0641/1431/files/zikudukagumifilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5687/1062/files/48103276918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/dufekaxejabovoranapumaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/xasegevejun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/tunaxawip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/gipumilasaboxirutezuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.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 5

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_off00007897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7897 5492 bytes
SHA-256: 4d892caae17538cdbb52cf86bff51932a507a187eea89b88c7b254eef241033e
font_01_sfnt_off00008b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B68 10952 bytes
SHA-256: c97095d9d4a85f91d93e76707098cedc026180729d4c91523136b50fca35f674

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