Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b11688b0f1e2fd…

MALICIOUS

PDF

41.7 KB Created: 2020-08-19 05:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f42ca56b4073c3ada76d9f66abac1540 SHA-1: 70e02eec9f346576f3c5c73c5abb92beca196f34 SHA-256: e9b11688b0f1e2fd4e89b67ee844614c2856c406aac09ef4e9a56ae445588233
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this is a PDF link farm, likely intended to manipulate search engine results or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this document.

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.ru/pify?keyword=aaranya+kaandam+movie++tamilrockers
    • http://werexi.mhssca.org/uploads/1/3/1/3/131381376/700378.pdf
    • http://kijojulij.awesomepawsacademy.com/uploads/1/3/1/4/131407945/339086.pdf
    • http://files.loradailey.com/uploads/1/3/0/7/130775544/92113f4b9.pdf
    • http://files.jewellerybyjody.com/uploads/1/3/0/8/130814475/4e493a026b.pdf
    • http://somoxo.townofpackwaukee.org/uploads/1/3/2/7/132710621/7717308.pdf
    • https://cdn.shopify.com/s/files/1/0432/6395/1003/files/tratamento_retinopatia_hipertensiva.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/53304100608.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/85801197767.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/miwevepedubituwedobogiwup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3516/files/vewotuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9196/files/public_finance_book_by_tyagi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6615/files/nafefevekobizeruranidez.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/jivetilomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.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_off00006326.bin
378bdda894c884f49fb26c403949c5a3cb22edf6c32a88d59630e6f1079b4d7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 5300 bytes
font_01_sfnt_off0000751e.bin
4b9e53b6a2aa897943dd51eabc6185b2b5f53b2d122e30868d6e8a221119f48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x751E 10812 bytes