Malicious PDF — malware analysis report

Static analysis result for SHA-256 3399bc761d2f6106…

MALICIOUS

PDF

60.3 KB Created: 2020-11-04 23:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 26e1bb67d34ab0ad9eae822a3704a99e SHA-1: 297a71106eaf57fd348b5e4972b540c64f0f05b7 SHA-256: 3399bc761d2f6106c79bfcaede01ccef39717b9e6924f5e9eef26927ed2d2278
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure and a link farm, indicating a malicious intent to direct users to harmful sites. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

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.
  • 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.
  • 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/123?keyword=non+renewal+of+lease+sample+letter+florida In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://bugalesatu.weebly.com/uploads/1/3/4/3/134309104/9142526.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/numijoseve_tomilom_lekiwedaz.pdfIn PDF document text
    • https://zuzolavilasobin.weebly.com/uploads/1/3/4/5/134523903/tedine_rovoromuxelupav_jupuzorex_xudobogajajonu.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/dudejelutoxoweterif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paropabaru/98115528036.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/clinical_pharmacology_for_prescribing_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75ae0ed-3db0-4826-8ae6-24cfd91fbf9a/30381724502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b04b793-8cdd-4efd-a637-53f4eeb4a3a0/94071525909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e4748e-7a97-4ef2-818a-8db3746f5f24/15753458856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd018e3-142e-4839-a3f1-7b9e7fb86c64/succeed_synonym_thesaurus.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000be21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBE21 22352 bytes
SHA-256: 55ec044a5fb1a8f6880e65091bb2534e4ea4b4455dd0084aae0e5274d4ea44b9
font_00_sfnt_off0000887c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x887C 5248 bytes
SHA-256: 7aee9c80720d602c39a2079546a43dd63a2b8bf3b5f2cf69ca4c929f20777995
font_01_sfnt_off00009a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A57 10380 bytes
SHA-256: 2f71668a6c0fd958f46f1de523fd9e4126515440c9a84cbb5cda567c05cfbf14

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