Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9da6e937356965…

MALICIOUS

PDF

53.9 KB Created: 2020-08-20 22:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89bba36c8f320e2390f393a005f23044 SHA-1: 38ce237214eab4008329c84c136ed7d8fee782af SHA-256: 0f9da6e9373569659fa49a6ee27b4d96d19b74ea67f227a4826adc1d18c031fd
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL, suggesting an attempt to direct users to malicious content.

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/pify?keyword=reforma+anglicana+inglaterra
    • http://sitafiwul.preciousdreamsdoghouse.com/uploads/1/3/1/3/131383314/mokejadu_bekuxijopawago_wuvusizi_xesebigowa.pdf
    • http://goxobalid.onethreefour.org/uploads/1/3/0/9/130969306/gufepejowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0409/2828/files/teponavobowakuboda.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/60349510566.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8502/files/identifying_subjects_and_verbs_worksheet_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0435/0309/1876/files/bt_home_hub_4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1215/3766/files/85391875265.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/98712380437.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/10082214530.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/72493270383.pdf
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/aptitude_test_with_answers_for_it_companies.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/99606399961.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/tunnel_cavity_preparation.pdf
    • https://cdn.shopify.com/s/files/1/0432/6277/1358/files/gijado.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_off000097c6.bin
250b8d1c18cfe75c347cc7b8d180bbde2afd44d4b48e297a77d90f46f6b517d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x97C6 5028 bytes
font_01_sfnt_off0000a8cd.bin
b2088d6ca0cc11859b0b3c0582fea3e5b13b2be4262cb85dcdd1e9b1d5ea8902
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CD 9944 bytes