Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5d317c2a744d09…

MALICIOUS

PDF

34.9 KB Created: 2020-07-10 20:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: c1fe708b01df8ed39e5d266b3f7ab952 SHA-1: e8f8aee0ccf8ab7dab2b446ca96e55e2508ab8cd SHA-256: 0c5d317c2a744d09879adeaf65a3db11726c7c6ce6e136db64dd18a2f2a024b7
184 Risk Score

Malware Insights

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

The PDF document contains a deceptive title and numerous embedded links, including a known malicious redirector, suggesting an attempt to lure users to download further malicious content. The document body itself is heavily obfuscated but contains references to the malicious redirector and a large number of links to external PDF files hosted on various domains, many of which appear to be disposable. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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.cc/wb?keyword=steal%20like%20an%20artist%20pdf%20download In PDF document text
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdfIn PDF document text
    • http://files.alyssali.me/uploads/1/3/2/3/132303075/deguger-nuzawetugexa-vosutidufigelo-nugepa.pdfIn PDF document text
    • http://files.gohea.org/uploads/1/3/1/4/131438150/902c87ef.pdfIn PDF document text
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdfIn PDF document text
    • http://files.diogenpro.com/uploads/1/3/0/9/130969834/9380885.pdfIn PDF document text
    • http://files.mussa.ca/uploads/1/3/0/8/130814337/vutabakol.pdfIn PDF document text
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdfIn PDF document text
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdfIn PDF document text
    • http://files.hawaiieventlighting.com/uploads/1/3/0/9/130969714/3527131.pdfIn PDF document text
    • http://knowledgeworldbook.club?bookIn PDF document text
    • http://knowledgeworldbook.club?book'0761169253In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tojufedeken.files.wordpress.com/2020/06/kigelefapobuvirimezawi.pdfIn PDF document text
    • https://linabanifogi.files.wordpress.com/2020/07/90013306368.pdfIn PDF document text
    • https://vomewew.files.wordpress.com/2020/07/mepiwipumugev.pdfIn PDF document text
    • https://lulepolagud.files.wordpress.com/2020/07/rejasirorovurapafep.pdfIn PDF document text
    • https://guxevevavun.files.wordpress.com/2020/07/41229327451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tulajemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/nonewevifubafake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/sazowujirinagoz.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_off00004d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D31 5080 bytes
SHA-256: 11948512ae125b7ffddeeebfddee9e1d31e3cf36dbf32b6048f1e36ad85671c8
font_01_sfnt_off00005e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E86 9476 bytes
SHA-256: 6116667114a361ff69b08dd7ef600c973971a6d12709174c5be538d46567cc5c