Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f28e303216d20…

MALICIOUS

PDF

50.8 KB Created: 2020-09-16 00:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1529e7887ba379d375f52f8162ef8888 SHA-1: 995ea9b715e9daeed29918c4620f0788c95c5321 SHA-256: f81f28e303216d209cb288fb0d71e796ddc83cdee05260220118d3d4b5e8087b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. The primary attack pattern involves luring users to external, potentially malicious, web content.

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.link/pify?keyword=mbta+rockport+line+inbound In PDF document text
    • http://files.stonesoupshakespeare.com/uploads/1/3/1/3/131379894/545ec277f30e3d.pdfIn PDF document text
    • http://rejegon.4riverscentercbd.com/uploads/1/3/2/6/132683014/12d2a7714e2b0.pdfIn PDF document text
    • http://tidijo.welsthailand.com/uploads/1/3/0/9/130969332/9422323.pdfIn PDF document text
    • http://vadom.scribeathisfeet.com/uploads/1/3/0/8/130874493/7057789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/57c819_357d0b73bcfa43b8b6e6576e9c79b609.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7ba596_03dd4c4a998d4d6d84aa92837d6e68f4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/086daf_1bdcb6b43bbf46ee8fc67491e10a31a8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f68081_884bb439f41b4e9581a42a022b260822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/lesamonazuvaxirudogenaxim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6756/3420/files/banal_na_aso_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/wemuxepinararexujuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/vtt_video_downloader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/5353/0526/files/sasokikozejutoxixonomef.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9b5f63_cb78cca6db424a92aa44d99ccca0515a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/10b11f_2dfbe418fbd54eb7811f06982dff616c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/defdb4_c37cf08135cb483e864525c2c5e08439.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 2

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_off00007dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 5100 bytes
SHA-256: b22affa4c3ee47a391167ce650ff902b2c7366f3e30f4b3e74f12cab3fd668e2
font_01_sfnt_off00008f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 15096 bytes
SHA-256: 5562274d134cdabbf19421760226edeb63ce6b7767143e6fe5a06aa9a24af6be

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