Malicious PDF — malware analysis report

Static analysis result for SHA-256 3868fd5e6bf362bf…

MALICIOUS

PDF

64.2 KB Created: 2020-11-02 18:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a62452a00725dba031671f89533f7d5b SHA-1: da9386f51aab5ac2eaad5bb105035282dd12eedf SHA-256: 3868fd5e6bf362bfcb2117868176ef4d2cc030e6b9b27c43e25d6ab583048e40
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=shito+ryu+karate+kata+list+all In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/22314755031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ac34a7-33d0-4e8c-a59a-190fc53825cf/gaburawal.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/goodnight_moon_by_margaret_wise_brown.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6489/3855/files/mcculloch_mc1385_deluxe_canister_steam_system_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/how_to_cook_beef_liver_and_gravy.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/97892872862.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/42002617806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/asme_y_14.5_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7609bf-9d18-4878-a580-88db79b1a04e/30064854687.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/tapagake.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000cbde.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCBDE 22752 bytes
SHA-256: 35d6b8d85f6f230c9510295d7baa75475f37c14911de5cd299c76b018d5bd6d2
font_00_sfnt_off0000791d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 9244 bytes
SHA-256: 706c47dda19e691a54f96fec3067a4758c5665e65ac517b720295ba7eb35a03f
font_01_sfnt_off00009770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9770 5040 bytes
SHA-256: d35701c9b8dccdfadbdaaa44d72ea3cc0601cdd783678d1f5416307cffcd1b28
font_02_sfnt_off0000a892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA892 10328 bytes
SHA-256: fe327a08ccd92853d989568eed0c83f57b3d82b11f2ed1e4a073ef5a66b43ed0

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