Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f066d7d8e2cec6f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-02 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33b2bc52443294213bbda35bc0d16939 SHA-1: eaef3efe73fd76aa930fae024377a22ebfcc2bd1 SHA-256: 3f066d7d8e2cec6fa351f1faa38b9eff293019373a667c1bcd321577a51ece64
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate content but lead to a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted from this sample.

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=how+to+breed+a+frostfire+dragon
    • http://files.harvieherrington.com/uploads/1/3/1/4/131407067/bukevezo.pdf
    • http://files.tashstouchgothicclothing.com/uploads/1/3/0/9/130969436/fegukotuvizozopike.pdf
    • http://files.friendsoftimbercrest.org/uploads/1/3/2/6/132681757/sexiwebadega.pdf
    • http://files.senorashby.com/uploads/1/3/0/7/130739415/7856015.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/ferelebagesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/97945155997.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5974/files/50636754847.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/13185150625.pdf
    • https://cdn.shopify.com/s/files/1/0431/0682/8441/files/49148808589.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/zatik.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/tivojivosagedovaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/37752983999.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/gobumokaxodufuzimosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3367/files/31770340406.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/zinikusumetujumiluketexot.pdf
    • https://cdn.shopify.com/s/files/1/0446/2634/6147/files/bosch_gcm12sd_manual.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_off000067f9.bin
c3928bfdd60bfedbb76133c2972f4492b7938592a049dc1e7dcea396edbd0843
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F9 5236 bytes
font_01_sfnt_off000079e6.bin
1859a5b960841821c861387966a7d1726d00d2691da418f5429783e3c207fe63
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 10360 bytes