Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c58ff2a7fdf83b…

MALICIOUS

PDF

43.4 KB Created: 2020-11-02 03:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0da32b2a7ea07ec1ce81e028d73bd7b2 SHA-1: 393116bb0fe06d0bc45b1f7809cbc348aa798c36 SHA-256: a9c58ff2a7fdf83b6efc1f6c67c32f41fa55ad688efdfea3c1c71862f4d09cb5
154 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 known malicious redirector. The document body, though heavily obfuscated, contains text related to 'motorcycle repair manual clymer' and a URL that aligns with the malicious redirector. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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.cc/123?keyword=motorcycle+repair+manual+clymer In PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/4918862.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/zadijej_kulofipu.pdfIn PDF document text
    • https://seriraradekabas.weebly.com/uploads/1/3/4/0/134016679/xumub.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/monevonoju_vupemu.pdfIn PDF document text
    • https://rubazepenomul.weebly.com/uploads/1/3/4/3/134324915/7154229.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fb492f-8602-40c5-b7d0-f24c78f12b0a/pejaxukutedakad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5201/3985/files/dd_3.5_talents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7629/6614/files/31520564904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7516/6620/files/nfs_most_wanted_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/1316653145.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/1137/1703/files/pioneer_deh_p4000ub_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bb55c0-5818-4f77-83f4-a29e74bee79c/popusegum.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6E 5008 bytes
SHA-256: e3ce8d0b2b962df990d3f02dd847723ccb4d04bb43e3e2326adf2bc71e2c8b40
font_01_sfnt_off00007d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D75 10452 bytes
SHA-256: 021c8ab37dba38cf80b52d5a50a971381a72b9388fd2d92619be93d2bda8ca69

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