Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8c82ccdee5dcb6…

MALICIOUS

PDF

48.0 KB Created: 2020-10-03 06:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bed452ee0889d29283b6f991c336e566 SHA-1: 61e06cffcffd27771e45c2d999d60114508efd3b SHA-256: 4b8c82ccdee5dcb6e58d8e1a83259ef2634b4103cac9225c13ef6c326ab936f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector URL, indicating a malicious intent to direct users to potentially harmful content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/pify?keyword=yamaha+keyboard+repair+manual', which is flagged as a malicious redirector. The presence of numerous links to Shopify-hosted PDFs suggests a link farm for SEO manipulation or traffic redirection.

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/pify?keyword=yamaha+keyboard+repair+manual In PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/nomigokiliwofeme.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/xufanixixisub.pdfIn PDF document text
    • https://site-1037094.mozfiles.com/files/1037094/purapudivu.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/fifomevutuwulolit.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/41212009019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8141/2007/files/zijonafalajewine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1577/7699/files/mekomonubal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8008/0801/files/minecraft_elevator_mod_how_to_use.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2913/1175/files/2003_hyundai_elantra_manual_transmission.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/linear_and_exponential_regression_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0602/1791/files/1789229157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2471/7723/files/51676029991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8044/5852/files/citizen_at4010-50e_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d013730d-60c0-4fd2-8e6b-0d26d5878283/pedaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8a49af-e080-4e37-b171-30d81dbae293/bawig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5665a2ba-6f96-4f72-a44c-aa9c91215883/28785404707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1275ab2c-10c5-40c6-a7f7-f9eaf4e32e75/10499064061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7376ad2a-d2dc-44bb-a2d0-9cdb4841545e/naduzabejisotuzisike.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_off00007cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD3 5288 bytes
SHA-256: dcf3de370306fbc82048aaabef38f62cf7648bb501d7c5b9696fd4d731b6d43d
font_01_sfnt_off00008ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA8 10516 bytes
SHA-256: 0ad51f969c78191cb2fbc0b631d9bb3b9e0698fe1d6f712fa41f6f311cc41051

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