Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d4f0b911dfeff3…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 12:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71c89602c7281801d5a0df2f1e8e3eb SHA-1: 70e38434e3a833b8002fad5faa5a7b570e38a753 SHA-256: f7d4f0b911dfeff3bb54ccbf9ca73398e496a1fddf93b128805a270fee1f0753
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or social engineering attempt. The document body, though heavily obfuscated, contains text related to a military service application form, likely a lure to encourage clicks. The primary malicious IOC is the redirector URL, which likely leads to further 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.ru/wix?keyword=ba%25C4%259Fkur+askerlik+bor%25C3%25A7lanmas%25C4%25B1+formu
    • https://static.usrfiles.com/ugd/63d3ad_83442f252a1e49959f1a140af0fb9208.pdf
    • https://static.usrfiles.com/ugd/b8c837_21af8a84258c46dd953fda9a5a1e816e.pdf
    • https://static.usrfiles.com/ugd/856cea_5ff831b8667241829d7b3f01f618f268.pdf
    • https://static.usrfiles.com/ugd/704566_d5989c757feb407b87b0272c8a37c2f4.pdf
    • https://static.usrfiles.com/ugd/a382ee_ab22d13906404b76b973ed9d5d148bc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5182941cd8684036b6e0e4b4ad047ed1.pdf
    • https://static.usrfiles.com/ugd/c20ea7_f1ac804c596146449142e1cf316b3d48.pdf
    • https://static.usrfiles.com/ugd/590778_acd0fe10e4a24edc84be1b1c1140eaf7.pdf
    • https://static.usrfiles.com/ugd/ea2f88_2ca7230e133a431b87b6927748683411.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/full_form_of_atmecs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/85828371546.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/31880481492.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.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_off00005e3e.bin
35184605c7a493fd4317010c65eb50ad4505ae298ba4b925d0d82deaf57e5a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3E 5608 bytes
font_01_sfnt_off00007138.bin
aa84fe2a517764603a0372b33f3efa68d366fbb292a733cf4fb7d5790509c09b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7138 11960 bytes