Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61b8d014acad0c7…

MALICIOUS

PDF

62.1 KB Created: 2020-10-30 16:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9ccd8e98860fdc31877861708299b74 SHA-1: d43f93395dd62ada607d3e81048321c881ffb3be SHA-256: d61b8d014acad0c7d2fa786186dd806b83bc1bffc8d62117143b571c2da18971
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://gettraff.ru/aws?keyword=ion+resin+exchange+cation In PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/6a3df928b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f8dd652d87ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f8e31c0861f4.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/7302827.pdfIn PDF document text
    • https://kolaxesow.weebly.com/uploads/1/3/4/4/134402722/katoweroresile.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/papirov.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://uploads.strikinglycdn.com/files/d4ec3ded-3532-4db1-9ba5-fd340c0b220d/colombo_crime_family.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/44894866835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4470/7236/files/41680164503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2220174d-8935-4b42-a0d9-c60f35486134/informatica_training_material.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8106/7421/files/codingbat_array_1_answers_part_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8283/4629/files/android_10_update_for_samsung_a30.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/kanji_look_and_learn_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/voxijosixotudexumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8906/0551/files/ascended_weapons_guide_gw2.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b1f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB1F4 24864 bytes
SHA-256: 00cfabc9978709e8800852ba4e6724cd25e4e1efb5ec6566eac52d637c783e42
font_00_sfnt_off00007b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B34 4820 bytes
SHA-256: 6bae6c193aaac6dcb797e7ebb4ea5c812dad0f0d46a2dba288ba692b21d2029b
font_01_sfnt_off00008b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 11316 bytes
SHA-256: 4e2e26debc50a0ed0f9f955ba49ce8e2b324b02b0911c451e0e877fa864d353d
font_03_sfnt_off0000dd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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