Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b406b0d6ed5b1a5…

MALICIOUS

PDF

55.5 KB Created: 2020-08-28 08:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7b01e4950855507c6893981ec3da2184 SHA-1: b52f7496821f83d8d18ce210542a5ca69595df99 SHA-256: 5b406b0d6ed5b1a57f411b1c414753006dd8d1f179ec104ca63fd7987b060385
154 Risk Score

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/pify?keyword=manual+programacion+android+espa%25C3%25B1ol In PDF document text
    • http://lukid.southerntierstarlites.com/uploads/1/3/0/8/130814411/4269997.pdfIn PDF document text
    • http://medib.mrsfoley.com/uploads/1/3/2/7/132740405/tawijopixefedimixek.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/1/0431/1239/9010/files/31324815085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/65258221644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4805/0586/files/zojiresigetosemig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/fivubusiguxegegebadezoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/lake_blackshear_crappie_fishing_report_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/sales_process_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8635/6375/files/xamun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/vejamumikodu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECA 5612 bytes
SHA-256: 9882ccd84ec5ebeb5a5340ac0b13ebf25012841266dd3b440b2c924147527501
font_01_sfnt_off00008179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8179 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00008a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A07 15216 bytes
SHA-256: 30505ea8f26d18a427c870089a9d4c94044f6229462ec8ffd0cf51ca3d43a044
font_03_sfnt_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 16352 bytes
SHA-256: d5c1d73facc1ee30369663d5bc9e1d56b1b6bad2d1eb0652642bc5daa7bdf87b

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