Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef35bbe94cd43aea…

MALICIOUS

PDF

61.3 KB Created: 2020-10-31 09:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: effb609cf41de7b0296bcfbc11314de1 SHA-1: 20efffb2d5b10650a1b5381593591836ab7bab2d SHA-256: ef35bbe94cd43aea493ba19de26e00628c5c4364e4dbf5b28d4ed84ecbed74c0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=my+idol+3d+avatar+creator+apk+android In PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/5230359.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/nirunidupobajapiwu.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/3329434.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/xetasif/52654670941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2493/0728/files/refatiwesomemekamodani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c26aca-1b5f-4e70-8a0e-2239ee4b8774/kuvijiroresowubar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8524/1759/files/teachers_guide_grade_6_2nd_quarter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/novago.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/the_left_hemisphere_mapping_critical_theory_today.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3357/5075/files/mobogenie_old_version_full_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/soviranofuxa.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_006_off0000b6ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB6EE 27484 bytes
SHA-256: c88fc07ff1460b7d96adda6cc6c743b213955ff63c78d58742b7a6db64e8ebcd
font_00_sfnt_off000069cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CB 5940 bytes
SHA-256: 192ffe932890a055abe301aace2a6ae41961757a2ca77dd0ecc80fc12ba959fa
font_01_sfnt_off00007e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E36 5284 bytes
SHA-256: 0c6f25e66c18b372fa0d30b211b6fbd1d03618654b816a71879f1bdb80b7c611
font_02_sfnt_off00009061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9061 11304 bytes
SHA-256: 64fd7b87c4ed1641a5dc74c53ae9b8bd9af795642a492bafa7317b3c50ce9ade

Open this report in the interactive analyzer, or submit your own file for analysis.