Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bee251797408f4f…

MALICIOUS

PDF

47.1 KB Created: 2020-09-07 17:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2d0ee8eb01b3113efc67c1da6d8d2f SHA-1: 6ba712c643b4f03805549e37a799f6fa04a58cea SHA-256: 8bee251797408f4f167822c50b4e7562f421e1ba9478337c0e49d2ff01910244
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, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware distribution site. The document body is heavily obfuscated and contains a URL that appears to be part of the link farm.

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.me/wix?keyword=daily+balanced+diet+chart+pdf
    • https://static.usrfiles.com/ugd/3d0627_71aba1fe296245f397ef15be11cda5ee.pdf
    • https://static.usrfiles.com/ugd/fbccce_95ad0061adff42fc9d475d01e99a0b9b.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_e54df2fad68a4937907dc9ecbe477cc4.pdf
    • https://static.usrfiles.com/ugd/880a7e_9c7b6a4743764a5f89cae9bdc96cb32e.pdf
    • https://static.usrfiles.com/ugd/6f9b04_4bf1659886bf48ada8cab318d330fe4a.pdf
    • https://static.usrfiles.com/ugd/b98abb_53cc13d3f3834be3afe8e7a7084a4a75.pdf
    • https://static.usrfiles.com/ugd/8a419d_48be27ff7ad9481c8f14e2e55d2a9b7e.pdf
    • https://static.usrfiles.com/ugd/cb2bed_3d4ea528277e451d96ba66b9059f8e83.pdf
    • https://static.usrfiles.com/ugd/2dbf5a_c938cab2830046f784b1001a21f1b0f7.pdf
    • https://static.usrfiles.com/ugd/3794ad_45fbea0e31e6412a909ef43833881a21.pdf
    • https://static.usrfiles.com/ugd/3ce946_5e976434660d4eeea077c1f4dc3ebc5a.pdf
    • https://static.usrfiles.com/ugd/bc79a4_29680a8dcd004dd6b78cdc5f02060b34.pdf
    • https://static.usrfiles.com/ugd/0779a3_f45e758aa1a44ab3949e663f7013a51e.pdf
    • https://static.usrfiles.com/ugd/229b11_d96fbb083f0f4d1aa452678082919d86.pdf
    • https://static.usrfiles.com/ugd/b910ae_f8cd10a19f3d412988ce665e5987918d.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_off00007a34.bin
fdc1914d04bd3ced160029a5da9a0b4b17f11afd93243aa78a4c59dc37dd2d68
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A34 5308 bytes
font_01_sfnt_off00008c41.bin
2358a8bea0bc12e3731049a17cb4f8c7055e4fdf85a2d99b9b88940a47879636
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C41 10460 bytes