Malicious PDF — malware analysis report

Static analysis result for SHA-256 442a0c3a2fb47dcd…

MALICIOUS

PDF

42.3 KB Created: 2020-10-15 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d1106fa89c08b63ac1791d66e0ed99c SHA-1: 6d6ab8a6e0c7e9f5c4b207c70211d8fbe6a6ac4d SHA-256: 442a0c3a2fb47dcdeea3ffafa11b4986cf8ea5b69e8588d825a879f7873a43c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body and embedded links suggest a lure for users to download something, likely a payload. The presence of numerous links to Shopify PDFs, some of which are likely generated for SEO purposes, indicates a link farm strategy to distribute the malicious redirector.

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=free+download+mt5+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f87612769918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f8761086fff5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/55216941840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/mini_flower_pots_michaels.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8521/5940/files/90678752631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/impaired_skin_integrity_care_plan_goals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9474/8573/files/tanokozepiwukipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/anchorage_school_district_sports_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/what_is_the_difference_between_manual_and_automatic_defrost_freezers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8414/5574/files/successive_ionization_energies_of_chlorine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8839/5936/files/the_great_plant_escape_webquest_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93613c4-f8df-48b4-8d34-3e1fe18353cb/nunilorumexevip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1e7613-1612-4855-bc64-e190116bb699/nojabijirogep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7641b8d0-10dc-4d43-992d-6efca9f4fe73/fizifemukinijepudumudas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8af61b-916e-4270-b217-8f672ee70f78/58271561787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c68315-4f35-4037-9eed-09ffebbfba51/98045872210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e233f9-d166-479e-8531-675116a924df/5745450639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394499d7-a71f-4fed-80de-2cfc18332732/ribakupifufapidavel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6722bdc9-938f-4d0b-9f25-8a8102d84941/seroxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bff83f0-375a-46fd-bd02-014bf33845ae/6978379495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c18bcb8-7db1-4ceb-b2cf-d412b74622b8/milofujenobubomufasaguga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9e2e29-b546-40fa-8cdd-e4cba7d3d77f/pavubekizajomapet.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_off000066f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F0 5160 bytes
SHA-256: 4c72309598eecbd7c1c5a1f0f88218dd653cb99d014405b2e64cbd7b548d06e2
font_01_sfnt_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 10448 bytes
SHA-256: e9f7b939a9d43547dc0d62e2a168f998d6faddb63261eb432abd364a17b3b327

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