Malicious PDF — malware analysis report

Static analysis result for SHA-256 51693222981695ca…

MALICIOUS

PDF

50.8 KB Created: 2020-10-29 22:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 09b2d64c62988bc9b420805d95005700 SHA-1: de4ab68a835705edf83e5acbe684e8a4e698bd60 SHA-256: 51693222981695ca5fe275cbd1443ead7dc4e3c781e4e10819eda4c8226c60c0
170 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is a redirector and part of a link farm, likely designed to lead users to malicious content. The presence of urgency and invoice lures further supports a phishing or scam campaign, with the primary malicious IOC being the redirector URL.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?keyword=bus+from+seattle+to+portland+airport In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f990a99790cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f9987d3d6915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f92c4f3e9c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8de89b87aec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zirojopemup/jawowuvijesarenuwuzim.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/72104820222.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/insert_youtube_video_into_google_slides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269d43bb-0985-4bbc-bafc-bc7960bafe91/97394901195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6469/5192/files/39596577969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d077fd-54db-43b3-b55a-1233a0b9118f/divergente_tome_1_telecharger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f092261-7541-44b8-8d42-5b0da31bb7a3/manual_de_fotografia_nikon.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 5116 bytes
SHA-256: cd24000a0279a13a5ca7716e6de860f4fb6c2c448fafd34b9ec5b3ee6c4a94b1
font_01_sfnt_off000073a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A5 11404 bytes
SHA-256: a391166c3ca75d87ee642a69d0257c368d91d1abfbeebe18f70488c4db29051d
font_02_sfnt_off00009aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAE 16328 bytes
SHA-256: f48e048927f4ab0e535fa64d7eded4ccbd2294e97bc270406cdb4ec60522c297
font_03_sfnt_off0000b03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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