Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f11270162cfebf9…

MALICIOUS

PDF

42.7 KB Created: 2020-07-08 12:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c69b25823c4cedff76fda756ffde5832 SHA-1: 0dca3ec5fd7a6c6e2613acbb46ff87f5fd0a0a70 SHA-256: 7f11270162cfebf976e370aacd28b70e4d344f7af88289dee0ce374ccd9067b8
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to downloading PDFs and includes the malicious redirector URL.

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://ttraff.ru/wb?keyword=income%20tax%20book%20in%20english%20free%20download%20pdf
    • http://files.alfurqaantours.com/uploads/1/3/1/4/131438468/856052.pdf
    • http://files.ladymaeimpressions.com/uploads/1/3/1/3/131379434/ba398.pdf
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://files.professorsilverblank.com/uploads/1/3/1/0/131070366/4949526.pdf
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdf
    • http://files.oldedwardians.org/uploads/1/3/2/6/132695839/rofanezusis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tetunenineb.files.wordpress.com/2020/07/12353187.pdf
    • https://lejixubut.files.wordpress.com/2020/06/xepuwitis.pdf
    • https://pajuxegob.files.wordpress.com/2020/06/bajijizemogatixuf.pdf
    • https://zazumug615548209.files.wordpress.com/2020/07/sivukigasix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006069.bin
e0555d433346b7f7253f328d77e723f30f82baaf0b8ce5e0c9a07b998014d08b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6069 5656 bytes
font_01_sfnt_off00007376.bin
d6a7a4994cf7ff072d33684b7b5625904406d2c92ab32c22c07c7e9ff5e2e821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 13540 bytes

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