Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca49e13d218958…

MALICIOUS

PDF

41.6 KB Created: 2020-10-31 07:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 92762606cbbc4bd5d60dc25f6ea0155c SHA-1: 90bc3559e1748af7613195faf92ebe51a7eb2db8 SHA-256: bfca49e13d218958fd58ed80f66c7af48f4a2294e36ffd1eeab17bf5657b6c6b
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.ru/123?keyword=english+lab+puppies+for+sale+in+ohio In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f94d0d53845b.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/f39f8d63-c5ed-47c6-8bdc-2adbfbecfb4c/29292035190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7415/1084/files/schaums_outline_complex_variables.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/ranafamaxoxosesowixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3267/7022/files/rerix.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/vorixix.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/deriving_the_quadratic_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/princess_luna_human_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ad9ac0-9747-4be9-9576-96e99ffc2961/81396788732.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/gaputug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e92d1ff-235d-4cb9-8b50-85d5d93d5cf4/54653773543.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/bmw_x5_f15_garage_door_opener.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/sueo_de_pongo_resumen.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_off000061c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C5 5260 bytes
SHA-256: 249f2b2b4a7f422f6d93f6f5c13df8d35c9ef67d8f00379c20e6e4addf26f1a2
font_01_sfnt_off000073a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A9 11144 bytes
SHA-256: 63c88eeb75bebae78e0ccb6917486c8fc1e1299786286d70bb5d2c920cd4abbe

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