Malicious PDF — malware analysis report

Static analysis result for SHA-256 735d784f522bebb3…

MALICIOUS

PDF

100.8 KB Created: 2020-11-04 20:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 42f616731a64abe1149b42954ad36310 SHA-1: dd3b1d4d620d4f38e222dd9a83f95303713b83e8 SHA-256: 735d784f522bebb301093da9c65e231f1a3b8637e4b7d992d55a394e25851830
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://cctraff.ru/strik?keyword=the+underground+steroid+handbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fa0970168e72.pdfIn PDF document text
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/tepupu-wigulirarofuwot-xubutewe-vaten.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://uploads.strikinglycdn.com/files/052c85dd-f01b-4271-8f7d-790953e5a0af/jidakomakumufulaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e039eec-efba-4b2e-9546-6337e5eda26a/mijozeduxuxamemuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/68534752225.pdfIn PDF document text
    • https://s3.amazonaws.com/lipekipuvenuji/amazon_prime_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/slope_hacked_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102c88cd-a282-45c9-bdf1-10d0a3a5b036/free_division_worksheets_for_2nd_gra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68497701-2e16-4b7c-a760-9459f96881dd/luveporodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ab4f98-8f6d-4f2b-9963-a4fad49ac845/zatitagaxunaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1568/0412/files/jeff_beck_led_boots_bass.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6843/2799/files/lowuvekesatogisudirowevir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b98566-9f7f-4487-aabc-04fa0ec9d2fe/28510106638.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/kedajemekezujapat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 5304 bytes
SHA-256: c812f65ffe16fd7670bd78df2654051d6dedafbb1320ced4f48fc714d5197500
font_01_sfnt_off00014ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC4 12224 bytes
SHA-256: 78be8b2202bd87e30e2d4e9137249cb7c4756ceea86223e646f583e1d9fc5c07
font_02_sfnt_off0001772b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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