Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9ebdaf08480c3f…

MALICIOUS

PDF

50.4 KB Created: 2020-10-30 23:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 54c08f10959f794b39ca56893af372be SHA-1: 856aa68e2def5dcdbe3d5b328845d5c471a480fb SHA-256: 5d9ebdaf08480c3ffc86925a4df5c3e52d64222b4751b9b9dd57d78ddb29833d
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 benign content, but one critical link directs to known malicious redirector infrastructure. The document body itself is heavily obfuscated but contains the malicious URL, suggesting the primary purpose is to redirect users to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

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.cc/123?keyword=therapure+air+purifier+tpp230h+manual In PDF document text
    • https://giledaxije.weebly.com/uploads/1/3/4/3/134312043/75f07caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f8d746c7a76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5f950d7ce69c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f87667e8bd5b.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/716227b6a9e.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/cb118fec-ec4d-4774-9022-ae85cb1da0d7/brondell_swash_cl950_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3a5e47-c9e1-4173-b3b9-588bb30590f1/nijesulovuloxugi.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/how_to_play_othello_game_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dba210e-5b42-434b-a286-2a41efcbbbee/wavejavifapevubisi.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/engineering_drawing_book_in_hindi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/xewuviperilofogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/273bff84-3dfd-4fcc-af88-e38b0565abec/lubaputagujuxop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6657/7062/files/programme_musculation_haut_du_corps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0536/0308/files/suwannee_county_property_appraiser_property_search.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/8532969403.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_off00008584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8584 5352 bytes
SHA-256: df7c613c61260dfb7718eee5bec0bbc774523dac41cfd4d86aa9889f047074a2
font_01_sfnt_off0000978f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 10996 bytes
SHA-256: e66f4b5f754cae238747bbd53bc9fb127096650be79c9af831bdd617e8ca20b6

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