Malicious PDF — malware analysis report

Static analysis result for SHA-256 398e1a99a9237952…

MALICIOUS

PDF

56.2 KB Created: 2020-09-04 19:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 08c05b7105a5960caa3dbee8a692ed05 SHA-1: 6dc72e2c99faa171cfee7faecb20b53317f600ff SHA-256: 398e1a99a92379523dd3bcc2bfdfbf4023c6b9ab8a61d08a2accf730b2ffe823
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that masquerade as a dismissal letter template, but the primary link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the document's structure and embedded URLs point to a phishing or redirection attack.

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.club/wix?keyword=gross+misconduct+dismissal+letter+template In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/93971e_ca5ac010d282432a924150d8a3a94c33.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a48928_9749e13e13b84d28a70d3e274f388496.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/82e28d_c23da1cbb6c54b10a93e0cf762f0f73c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dc6899_91c980e6b1d948cfbabae34914aa9668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/0817/4743/files/android_chrome_proxy_server_settings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/93595838897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/65798275060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6032/0669/files/mol_bonggol_pisang.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/vukibaponukafomidibunap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/19703990426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/83782252277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/convert_long_to_string_java.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/83d902_50e66ddfbf1840eb84a7398d3030b021.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b48b60_45e9657daaaf4b8e955e59173a9abe8c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f96b02_352ffd64dede4cafbf8bf00e05c2a867.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d48fe3_70cce48e0e9241448f3598b5ffdfabba.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/868f76_5d281cb491734fe0bf98f042941b6787.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9401 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off00009dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFB 5252 bytes
SHA-256: 6f1c6cbf6d89c2cfa8139ff1e133d36bca1c1022f071883dfa0dd182cf23ba5d
font_02_sfnt_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 9824 bytes
SHA-256: 67bc40f368a0e6ff7bca180b39980587ed0ddab83324dfcf912959654fe56c0a

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