Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d866b1bc23712b…

MALICIOUS

PDF

47.2 KB Created: 2020-11-01 20:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b5b24ef13013f3a358d80e0a033a141a SHA-1: 958836c1e4d3008cf905497f8225aee27f075e1e SHA-256: d1d866b1bc23712b8013c1dca86d43548dedabbb0e81e35b3063742722bbadde
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/123?keyword=2009+chevy+malibu+service+manual'. This link is presented within the document body, disguised as a service manual download. The presence of numerous other PDF links, identified as a 'PDF SEO Link Farm', further suggests a malicious intent to distribute harmful content or engage in link manipulation. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=2009+chevy+malibu+service+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f9e2356de4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8906d206df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f8e84bb8398f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f9a1c3814815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f8821113bbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f8fb26438161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f8e5d381736e.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/1/0498/8449/6026/files/aua_guidelines_testicular_microlithiasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25abc958-0987-4557-a278-3bccf2cc3f32/libro_de_cocina_de_la_seccion_femenina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accd12e2-de8b-4a5a-8f12-9dac4e2f6b2b/gevinowaboda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/cen-tech_battery_charger_60581_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5198/1244/files/tanu_weds_manu_returns_full_movie_watch_online_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd89d27-d912-49f7-8559-47c3dc294105/55620550517.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5284 5368 bytes
SHA-256: 09f8e2608533cb87c1f76e9bc8ae3ceeccfbf9bf0deb76b3de47b7a873e0bcf4
font_01_sfnt_off0000648f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648F 10412 bytes
SHA-256: 353f2e51b95fafd2a756d3f9a810842b766b57c39c614346734301dd450012f5
font_02_sfnt_off0000886b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x886B 17192 bytes
SHA-256: 1368ae93e24b53e75f14ab91ec9fdc2ea14a218e0960ab8f36b81e6756e654bb
font_03_sfnt_off0000a188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA188 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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