Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4050af4798cb3a…

MALICIOUS

PDF

45.1 KB Created: 2020-10-27 16:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b51bbdf3303aa6488c305a94b39b888 SHA-1: 9162fb360f58f707178f74c4fef304fc51602198 SHA-256: cc4050af4798cb3aa4afe20c9622a439eadee87fa69665a32a2e87fe34f78e50
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to redirector infrastructure and link farms, indicating a malicious SEO poisoning or phishing campaign. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious URL identified is https://ttraff.com/123?keyword=ouku+double+din+installation+kit, which is likely used to redirect users to further malicious content.

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.com/123?keyword=ouku+double+din+installation+kit In PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/giradadiniw.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/favepin.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/mokitegowaf.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/depamawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5f97df307c3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f94323fa5e0d.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://cdn.shopify.com/s/files/1/0504/5046/4945/files/heavy_vehicle_roadworthiness_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4299/8938/files/xorimixefoxolal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/gowibiwepoxagala.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/44886278348.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/rigiwedarumirorev.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/saxon_algebra_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cfe410-664b-4b18-8f39-92483aeb386b/mozuzaxomunoputonelipuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc94fcd-c44e-48f2-ba1a-01d9821c9f1b/rosorotug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3e3e9d-1b63-4790-9692-4ded154d7d23/6688480889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7926/9541/files/88817868589.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4661/5231/files/linear_regression_model.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3397/7247/files/best_android_reader_night_mode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/how_to_start_a_business_letter_in_spanish.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_off00006626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 4836 bytes
SHA-256: 8094906edbe982ffdb85410ae21ab90910ae92a2b1562fd456da7bde2d0a5953
font_01_sfnt_off0000769e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x769E 10140 bytes
SHA-256: 03ca91ed2b4ba680517ef94a458e18d1d9ba7bb525db928c4980d6ed5e0d8585
font_02_sfnt_off0000995c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x995C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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