Malicious PDF — malware analysis report

Static analysis result for SHA-256 50caaddca81e64be…

MALICIOUS

PDF

43.1 KB Created: 2020-10-14 20:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fe0f859c9a0651c747f39010ef7ae597 SHA-1: 2f0bf6ea3aaf24245a534120286e6cac0b2ee1b6 SHA-256: 50caaddca81e64be28070c8d2b451dbb70b122eefc86feb49a16edc24f6e16c0
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'eenadu telangana news paper pdf'. The ML classifier strongly indicates maliciousness, and the link farm behavior is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/pify?keyword=eenadu+telangana+news+paper+pdf In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/2766757.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/vipezariwe_regumegotez.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/velimi.pdfIn PDF document text
    • https://site-1039735.mozfiles.com/files/1039735/filusuruwufetesowo.pdfIn PDF document text
    • https://site-1037827.mozfiles.com/files/1037827/jexibizupopuv.pdfIn PDF document text
    • https://site-1040513.mozfiles.com/files/1040513/94710315809.pdfIn PDF document text
    • https://site-1043153.mozfiles.com/files/1043153/75876936883.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/28710833773.pdfIn PDF document text
    • https://site-1038830.mozfiles.com/files/1038830/bubaxif.pdfIn PDF document text
    • https://site-1041384.mozfiles.com/files/1041384/kolifanikigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f86ff8674613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f871d56efe7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f870f015d95b.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/1/0428/5366/2876/files/zikotaroxikepudovuxolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/christian_domestic_discipline_cdd_marriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e345fd8e-cfa9-48d2-90bc-5dcc1bc1a5f7/75767154853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a982a5e-827d-4a9a-87af-fe823c51e76a/lobadumib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217c4446-3133-42f2-b1f0-af7d30df06e9/78578729283.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_off000069bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BD 5256 bytes
SHA-256: 4d746591ec8841d68dd9bf7c436c30e49d33b889048a35ab67d26eb3f31a555c
font_01_sfnt_off00007bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBC 10488 bytes
SHA-256: 88eae34b845d3bdc71ec12fd24975a58cd195170bde19ccde20653ee2d590077

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