Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7d0122f8037a1d…

MALICIOUS

PDF

64.0 KB Created: 2020-08-30 01:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76ef542fee47ed0388716161add0c82 SHA-1: c7f4c4426d878d7d2a248db7962c959844cc5f54 SHA-256: 3c7d0122f8037a1d9689f398eddb355b970f507878fb9816fad9cbbf62a5e4d0
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=asus+hero+viii'. The heuristic 'PDF_SEO_LINK_FARM' indicates that the document is part of a link farm, likely designed to lure victims through search engines and redirect them to malicious sites. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malware distribution attempt.

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.com/wix?keyword=asus+hero+viii
    • https://static.usrfiles.com/ugd/dd4472_4d177dec33744429944b6a12a022ed86.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_dcbab34f4c424cd3934ac50737a3f96a.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_99ef40118d824932970107dfb5fa2fab.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
    • https://cdn.shopify.com/s/files/1/0434/2710/2876/files/26948916903.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/gudana.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/21986180173.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/voferotef.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/betfair_sportsbook_app_android.pdf
    • https://static.usrfiles.com/ugd/3e87bf_d65851ba17a14c3fb3ee4d98fd29c00a.pdf
    • https://static.usrfiles.com/ugd/d162e3_3fefc7c0675c4ba8b976ea142c9be62f.pdf
    • https://static.usrfiles.com/ugd/efb3f0_b8d65d2002d946d194d2eb9aa708c793.pdf
    • https://static.usrfiles.com/ugd/3bca44_5deef28ca2854a3d949468feafe8842a.pdf
    • https://static.usrfiles.com/ugd/bb13a2_3132c5a99db943cfbd08e2d0e0c892d7.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_off0000b64b.bin
2ece6fe4283830de8f62c9b7008053a84ca460e0d430689be5ad749dd7d7d132
pdf-font-stream PDF embedded font (sfnt) at offset 0xB64B 4580 bytes
font_01_sfnt_off0000c5db.bin
49baafb5893f3406274af483b0b33873f02e1dff96504c4719f72e3f9eedfbe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 14692 bytes