Malicious PDF — malware analysis report

Static analysis result for SHA-256 217cec1ee2d5e227…

MALICIOUS

PDF

42.3 KB Created: 2020-10-31 08:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 05675ad7e108bde03f22314d2e401559 SHA-1: e772034db4bb65062b724960481bc925b75f4a59 SHA-256: 217cec1ee2d5e227b00385dc0cc3e1a399f009a0c3b11c54aa53a3925db49d99
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 URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to reference a worksheet and includes the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute further malicious 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.com/pify?keyword=vertebrates+invertebrates+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5f9075dbda68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_5f9c4727b1236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5f9c51341e9eb.pdfIn PDF document text
    • https://retagavit.weebly.com/uploads/1/3/4/3/134363188/4828596.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/5484608.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/zaxoga.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/9942166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5f8ebc7c46e07.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://s3.amazonaws.com/jolituzoji/63365212913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/9918/5312/files/apk_mirror_video_downloader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/baby_jogger_single_carry_bag_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6900/3680/files/death_process_after_ventilator_removed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/kojapelumarik.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_off00005793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5793 5204 bytes
SHA-256: 0f82bbf4ed23f974a51f63eee0e74c9b555234c201a916d0c8ada543c74eb6fb
font_01_sfnt_off00006946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 10896 bytes
SHA-256: 910dec3c751ce234b371f63281f726427d5c7113af770e8742a958d0432b0322
font_02_sfnt_off00008e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E53 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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