Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e7bfff056be0a9…

MALICIOUS

PDF

54.9 KB Created: 2020-10-19 16:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a476c6b8830da15ac04e551ed3e36d1e SHA-1: 9c921a14ccc93e8b789542b6e88dbf38bd37f4f2 SHA-256: d0e7bfff056be0a9cb36a0a5475a34ca8896361f362da1a82152a99cfc80d01a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.link/123?keyword=find+area+of+shaded+region+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8b1be688bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8d4afea9a00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f8780e69a5de.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/1/0436/7250/2425/files/96085588887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2743/0059/files/convert_to_to_excel_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/sokimosewona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5228/2268/files/latin_first_declension_masculine_nouns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1475/3951/files/english_alive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8226/2949/files/29885926300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/sync_google_photos_to_android_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3293/2252/files/58915332693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f941f1-b855-4b1d-be6c-7d18ab811ca7/binigosusogunaxawon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5eebb3e-3b2f-4805-a7d3-32f695f00ca1/19389117649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da25b6e-5b88-4883-946b-318aab4a37ce/7489267711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ec0f56-6784-49ec-84d0-a40ec275e76b/gitejejati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecd2ed4-6118-4e8c-ac22-218d33330388/drastic_ds_emulator_games_for_androi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1400/3098/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/resumo_cidos_bases_sais_e_xidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19555853-2fc3-4020-81a0-aa3cc261a463/31959150401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc479730-98df-45ce-9b6a-11ae215dbc42/zuwazo.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_off000088b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88B0 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off000092ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AB 5384 bytes
SHA-256: 930961915bf954b9e70a7c02b6777dfad33e525f7a94bfc0b3867ff89e2e9150
font_02_sfnt_off0000a50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA50F 12008 bytes
SHA-256: f18967591316b023cef6770d7c3a52a375e62037d332d7aefa18cd1ad6d44d4b

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