Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4d5fa14a0eab8d…

MALICIOUS

PDF

41.8 KB Created: 2020-10-27 21:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: de4fe048d4485b057d2af651851e1f52 SHA-1: b8e3b49302a9beb03f3e368857b10f44e44f1ae6 SHA-256: 1f4d5fa14a0eab8d006b1091bb3c9f7ccc3abd5147ff39cd553f7b57542c7b03
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/123?keyword=global+pet+food+outlet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5f969579e1ed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5f8f2ffa5a26d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f8af2fe573e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f95f82fbb9fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f8eaac5084a2.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/d7cadd96-b201-4125-951f-cb6ce9ef914a/tidisut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fdcd77-d3da-441b-abb7-7e35fe37de2a/68126892368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f44825-c9b8-4bdb-afc9-bad08e20358b/45977642048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d105b35-7c26-4750-a017-5da75a557670/zipamexiririrekaketaro.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/can_bus_protocol_bosch.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/mirodimuraleberunisuto.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/download_amplified_study_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51baeac3-33d6-4027-b1b1-8f1b66a3debe/quimica_inorganica_chang.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2613adba-9023-4a9d-822d-4c08a70ce265/773-_599-_0180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a32127-b6a4-4b00-a74a-65438c8ddca5/16474498308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9773e6-20b5-4ed7-b682-db16cd6e3ef9/kifuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9300d93-731c-44d5-be3d-47b2b6b3d736/63887306865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3637/9816/files/23130837110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7579/6644/files/accidente_cerebrovascular_transitorio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2821/8524/files/55809551623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2940/5108/files/download_opera_mini_old_version_apkpure.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_off00006555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6555 4932 bytes
SHA-256: 6a3d844c3e0f3668d167b81668c0fdc56ade7c1744c1c60166f3ea5eba7b0606
font_01_sfnt_off00007630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7630 10876 bytes
SHA-256: 0b8c9ac57cf5e9ceb992907750657a7b6e5b4eff3ea801faa74bbe0cf5f7e5c7

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