Malicious PDF — malware analysis report

Static analysis result for SHA-256 346ae7db5de960f1…

MALICIOUS

PDF

48.6 KB Created: 2020-07-13 02:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa7a88ce7f3785138fe56932d529333 SHA-1: 164388e95cc6738d9aae46c428b38324ba37f8ba SHA-256: 346ae7db5de960f16198effcddc8fa65f8b80208cc6bb7d5be56f3167cfb8646
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious content. One critical heuristic identified a direct link to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive use of link farms and redirectors suggests a phishing or malware distribution attempt.

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.cc/wb?keyword=english%20quizzes%20for%20esl%20students%20pdf
    • http://files.lastangelstattoos.com/uploads/1/3/1/4/131437147/paxosimegozeriw.pdf
    • http://files.adhdpasadena.com/uploads/1/3/1/4/131438423/tamatudu.pdf
    • http://files.liquidsunshinedesigns.net/uploads/1/3/1/6/131606644/6427307.pdf
    • http://files.karamchetty.net/uploads/1/3/0/9/130970009/adfe26573af.pdf
    • http://files.scaturchio.info/uploads/1/3/2/7/132740498/a3cca4a8.pdf
    • http://files.findingbea.com/uploads/1/3/2/8/132814980/2ce0a7277a.pdf
    • http://files.ericahitzmanart.com/uploads/1/3/1/6/131637482/luvuxe.pdf
    • http://files.mellottmedia.com/uploads/1/3/1/4/131409557/718084.pdf
    • http://files.scaturchio.inf
    • https://lasojunobewe287962433.files.wordpress.com/2020/07/fonurovumobes.pdf
    • https://kuroluf.files.wordpress.com/2020/07/47090154061.pdf
    • https://mujorivuxa.files.wordpress.com/2020/06/82289536121.pdf
    • https://vavimanuda.files.wordpress.com/2020/07/tujevalibigibemuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/zepenuzijitiserene.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53981477141.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/50490006267.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75877947267.pdf
    • https://cdn.shopify.com/s/files/1/0428/2823/4908/files/41578840741.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f05.bin
842c28b2552b88021ce0077f0ddde64106dcf8a7d9e29198ba4da281a79c22b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F05 5108 bytes
font_01_sfnt_off0000905f.bin
14456dbe43dbf1671fb90ca218f9461a8ce269949bbb352562ed1d2ebb76aeee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905F 10608 bytes

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