Malicious PDF — malware analysis report

Static analysis result for SHA-256 522cef40fd3ed971…

MALICIOUS

PDF

43.6 KB Created: 2020-10-28 09:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 243fec332f52137899885ada23f14986 SHA-1: 3657ced46a323caa55986bc1af137ca2e8fe34f8 SHA-256: 522cef40fd3ed97115571736e7c2a4e18738c8c5e20b391c983c6bb33b8eb7be
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits malicious behavior by linking to a known malicious redirector infrastructure. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content. 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.link/123?keyword=flower+hat+jellyfish+description In PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/relidaxefameled.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/82c8ae05404.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/4188a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/kiresaketuvezami.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/25892996792.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/fufazedarera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73767963-035b-4192-a9a2-eb005e3ce8ae/6744998707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c40c42-7123-45f2-b319-9a6f731a26b9/mejosugaxoxudilar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/99892909462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/80872345069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/worediduwizizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3481/9783/files/download_boss_revolution_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9847/1073/files/passkey_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3497/9751/files/wulomopoxuzufewiditowivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/turbo_vpn_mod_apk_2.9.5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/holt_mcdougal_literature_grade_10_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/91533849594.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/zanitopogizukikabege.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/goodreader_ocr.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_off00006b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B23 5468 bytes
SHA-256: 0a1e467a2792456bf2cbe03786a16749b58504ad1a36ab6de4101fdf01cde97a
font_01_sfnt_off00007dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD8 10248 bytes
SHA-256: 5703d9332dfb367841e0e1db014fbd57f40981c5965858cdbf6f10384facd577

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