Malicious PDF — malware analysis report

Static analysis result for SHA-256 057e02bdf99b3f6e…

MALICIOUS

PDF

60.9 KB Created: 2020-08-22 02:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3b17059cd1b882b04d9b75f7b6042a3 SHA-1: 4624b9fafd413fb934402f1401b383203ec64cba SHA-256: 057e02bdf99b3f6eab28db3179b9da11143798b87da0f3e505b40ae5b4630fc9
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=former+archbishop+of+canterbury+carey'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to artificially inflate search engine rankings or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=former+archbishop+of+canterbury+carey
    • http://files.nych2o.org/uploads/1/3/2/7/132740502/dasujijuk.pdf
    • http://files.michaelkressdesign.com/uploads/1/3/0/7/130775245/be842aa3e99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/special_occasion_speech_topics.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/9502606324.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/bejisajilixawifadeveke.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/24178525322.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9078/files/present_perfect_tense_exercise_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/72238717004.pdf
    • https://cdn.shopify.com/s/files/1/0464/7275/7406/files/18909029891.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/worimesomelolasuvaxavole.pdf
    • https://cdn.shopify.com/s/files/1/0461/1591/3892/files/fexov.pdf
    • https://cdn.shopify.com/s/files/1/0433/9902/0696/files/prepatellar_bursitis_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/tuxepisozorinudedawuduvo.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_off0000b10b.bin
c604259255a3d8301a292e1f859f94452ad839b1cf1d1c9b1a1947af166fb253
pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 5420 bytes
font_01_sfnt_off0000c35c.bin
0bc807f2265c3c9b1f1ba06e37f188eea3b3c313b16fdabd417110f84a17ff99
pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 10228 bytes