Malicious PDF — malware analysis report

Static analysis result for SHA-256 d921a91294799ddc…

MALICIOUS

PDF

53.7 KB Created: 2020-10-28 14:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b43bb4d647ea4b527f375f0b46dbdef SHA-1: d8d423576029bf76e31a3d326ac099c05e3c8288 SHA-256: d921a91294799ddc97ff101d0664c08d1acb725bda192a6c092531eb31d6a56f
154 Risk Score

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.club/123?keyword=toyota+celica+repair+manual+free+download In PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/zapojer_rosavux.pdfIn PDF document text
    • https://pijezokonogoxa.weebly.com/uploads/1/3/4/3/134308979/wowalobebil.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/391d9f195a0c8.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/65bfaa.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/1/0498/7423/9646/files/kotlin_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3009/1688/files/84926691684.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2393/9753/files/98619028882.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/acr_guidelines_for_rheumatoid_arthritis_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2381/7623/files/72846436647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8619/3844/files/ga_credit_recovery_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/ncert_book_in_hindi_class_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1701/3912/files/ciclo_evolutivo_de_ascaris_lumbricoides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/logitech_wireless_keyboard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/nifitesapetepofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0254/3261/files/tobins_spirit_guide_real.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3336/1045/files/scriptures_on_forgiveness.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/pojawaludazenat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/nigikazefimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8778/1287/files/83756432304.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_off000066c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C2 14676 bytes
SHA-256: 99926dcc06bb3cde874b6214b9f7b4edd9aae35af81085dc5e1dff8202876233
font_01_sfnt_off0000932c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x932C 5268 bytes
SHA-256: bac1dcb0ee9afe98d1735b39ad48478e2740594f5c6fd2204875789af76c6bb8
font_02_sfnt_off0000a51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA51C 10468 bytes
SHA-256: 5f4211191d0e07b7ddb805cb03c81e19e98f3685bd573f91f20104612860baf2

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