Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cef520635b092b0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-15 18:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f78f2f500cabd8cbbce24d3655c446bf SHA-1: 5959898dcec0527edc27e1ae00f86570bcffc7c3 SHA-256: 0cef520635b092b015a24463a98ea430a6708f26ba3a873ef8e990d50a52046f
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document title, aiming to trick users into clicking it. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection scheme. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/wb?keyword=pain%20score%20scale%201-10%20pdf
    • http://files.djfndctn.net/uploads/1/3/1/4/131453177/534682.pdf
    • http://files.fertileearthartworks.com/uploads/1/3/0/7/130739651/6095877.pdf
    • http://files.markbsm.com/uploads/1/3/1/4/131437362/zaxilokowusizibixi.pdf
    • http://gejadiwa.welshpromscymru.com/uploads/1/3/0/8/130874276/wejep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4925/4050/files/caracteristicas_de_los_enlaces_ionicos.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/362294329.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/61628447022.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7206/files/27916816441.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/imbuing_guide_ultima_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1449/files/6222087596.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/75656702260.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/85345685425.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/jegijimatipenezireraxano.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/vexusobisiwulipoxexamu.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_off00006768.bin
4f249fd51c6a00d255c8d77ed39f7f709596ffd63bd87ae1c103056b89998db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6768 5376 bytes
font_01_sfnt_off000079b9.bin
4470d9cb6e1c6c22ac3ae1fefeef59e164ad0435ca91ac0a62edaf7dda5294b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B9 10456 bytes

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