Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a25d3adf050c337…

MALICIOUS

PDF

49.4 KB Created: 2020-11-06 04:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 16261d3064ab80da5f9e66a62db4816a SHA-1: bf668fcfceffb2f198acb74659844c9e6aa0bd4a SHA-256: 4a25d3adf050c337e1ef4f78afb3f0d77fef487257bb158aa881c62f2d51075d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains multiple embedded links, including one pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'Hierarchy of needs definition' and a URL, suggesting a lure for users to click on malicious links. The presence of numerous external PDF links further indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/123?keyword=hierarchy+of+needs+definition In PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bajato_zavomojugadep_kizofajufem.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/wosifib.pdfIn PDF document text
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/5240791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5f9c9a49564d0.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/kasuwevovog/minecraft_infinity_gauntlet_mod_1.14_java.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/podafusekobekexidolowas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7660/8685/files/58603779940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde76d29-fd11-421b-b3e6-a54efcf72787/.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/37876165180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660c7360-46e0-4d4f-9b4f-f6f52ebb3d25/85541023503.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/16389373917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6927/8881/files/papike.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_off000072b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B8 4928 bytes
SHA-256: e787b3de246dbc818d421c7abb720462c239f74daaa4078db9d887c12fe564f1
font_01_sfnt_off00008370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8370 12084 bytes
SHA-256: b8d75c1f7ef7a3fb3f5bded73746055e5855e5aca6c35fa0b4c02f070dce164c
font_02_sfnt_off0000aade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAADE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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