Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a241f38f452c775…

MALICIOUS

PDF

39.7 KB Created: 2020-11-03 12:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 48a5f203b01004d829b589ac525af8c9 SHA-1: 1644d4cd72406c87baf7eb9a42b9bc59bc798c63 SHA-256: 7a241f38f452c7752ee67a9765d10f3b502fa39d5e142d90a378df57a2d3f462
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, potentially for phishing or to distribute further malware, aligning with a spearphishing attachment tactic.

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://ggtraff.ru/aws?keyword=giant+seaweed+osrs+ge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_5fa0c19a56a11.pdfIn PDF document text
    • https://fojejebub.weebly.com/uploads/1/3/4/2/134265807/mamonisigatilovasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f8dc16e1bf3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f992e93453be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_5f9e85289a8e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f9d53347be2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f945b8f3cbd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8bee43075d2.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/71be519f-c922-4545-b4a1-166a2f1429f6/kagan_cooperative_learning_strategie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc50d9d-baeb-4018-9e4d-72656ae5a98f/kafomubakidev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0927a8ce-366b-429b-aa9a-b94551c65f7c/lipaziwipolasokaduneluxax.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/political_and_historical_lens_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/44082402951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0645d7-175a-4515-92c7-e40f62635eeb/raxusapevepapawaladip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0915b62a-57fd-4928-b3f7-e1e491a8de5c/18649740233.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_off00005a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A28 5084 bytes
SHA-256: aee0ef41518a71e58b632bf5a2e66909e6fd6d9c9c4cd70178eb81a9af40eb04
font_01_sfnt_off00006b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B95 11352 bytes
SHA-256: 2ffa35fd3cc6e011a5d7a437a554777088d128fa12d423b98f38fedeb48a535d

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