Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a6b493dcde5250…

MALICIOUS

PDF

39.9 KB Created: 2020-10-28 19:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 55b1f94b567695ff43a563828a746f93 SHA-1: decb4fbb58a2daf329bb06082d885a76474574e2 SHA-256: f7a6b493dcde5250f855d45c689f5ad1ba79b38de4453bced29a83f1750dec16
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.cc/123?keyword=spread+eagle+cross+the+block+sample In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/98971604748.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/both_and_either_or_neither_nor.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/les_auxiliaires_de_modalit_en_anglais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde25c3e-7d2a-4e01-939f-c9b916590b0f/jajoforenenaxasijuxifudit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4611b525-525a-4f65-9df0-0dc1f07a31c8/12733017711.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/fundamentos_de_biotecnologia_farmaceutica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43257116-c764-408c-a907-1666592be18c/40345000427.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dogevexelivokepigefav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d844f4de-9318-4b54-b069-3ead5b973deb/domivojujisakorirovajiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abda3de-9df9-4491-8de3-83149e26b524/vobisaret.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7189/6741/files/moulinex_food_processor_masterchef_20_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/ajax_request_response.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/83322721291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8030/9666/files/where_to_inject_igf_1_lr3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/384463400.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/how_to_change_to_word_on_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/72085199869.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/atlas_of_medical_microbiology.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/albumin_test_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/84320760510.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_off00005bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBD 5796 bytes
SHA-256: f34888ccbb539b3da16310da5f2ce7dbfbbde1275bf1cb94a4dc033b84fb7284
font_01_sfnt_off00006f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 10368 bytes
SHA-256: 2c576deedd6c6bada3a0bc8c0f658614ed9ce8f5fc2e04229c4c038dab48ad94

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