Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b633b48c7734f…

MALICIOUS

PDF

45.5 KB Created: 2020-08-24 03:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265c257ee99943cea44cc8d632296c74 SHA-1: 7d05dcf6a914a7e7c6acbb1fa4089a3951c1cd0f SHA-256: 984b633b48c7734f5f4fc0d8cce24f6f3fa10f373bafa29ad60c22556710e1ee
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=calendario+2019+mexico+pdf+para+imprimir'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded URLs, many pointing to Shopify, which is characteristic of SEO link farm techniques used to improve search engine ranking for malicious content. The ML classifier also strongly indicated maliciousness.

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=calendario+2019+mexico+pdf+para+imprimir
    • http://files.learncprnyc.com/uploads/1/3/1/1/131164156/xakeberate-nesemugi-xugidofime-junigapopakefe.pdf
    • https://cdn.shopify.com/s/files/1/0440/9108/0869/files/31854898298.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0968/files/93249169517.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/jofataradasusin.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/45718279268.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/vivexiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/falco_arturo_perez_reverte.pdf
    • https://cdn.shopify.com/s/files/1/0428/7794/3967/files/dictionary_english_to_bangla_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/5681581576.pdf
    • https://cdn.shopify.com/s/files/1/0436/3429/4937/files/acca_f9_financial_management.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bb1.bin
f839b272693cbda64b3050c22db02dc348b261adcd32fd5cb475bd2ecbe7ac12
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB1 5580 bytes
font_01_sfnt_off00006e9b.bin
d5e73f31e7641ced90d9d63e58f1c26ff6a6937d5a2df41c53b29cb502524269
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9B 10864 bytes
font_02_sfnt_off00009244.bin
3230dce6ac9cc1c618afe6e700bc01bad4c14b8490cb7e773368fe91bfaf5e97
pdf-font-stream PDF embedded font (sfnt) at offset 0x9244 16224 bytes