Malicious PDF — malware analysis report

Static analysis result for SHA-256 631a595905c2a3fe…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 06:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99ee5e3d14b972f0b3a2926b65f1dab7 SHA-1: 14d93c54aa8620a51336857ba5c0a30a37d10d37 SHA-256: 631a595905c2a3fe54be4fc0f8848fa9a8ff25e877a75afc5ab5db88118c1314
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a direct link to a known malicious redirector, disguised with keywords related to a popular game. The document body itself is heavily obfuscated but contains the malicious URL. This indicates a phishing or scam attempt designed to redirect users to potentially harmful 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=five+nights+at+freddy%2527s+4+download+free+full+game+pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8205/4813/files/bolekisisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/29804539521.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/kerobivifobuwutipa.pdf
    • https://static.usrfiles.com/ugd/8b49c6_5caf4729d8da41ea8f20858fea17242b.pdf
    • https://static.usrfiles.com/ugd/19ce5d_c1d955c1a84849c598c138d2b074d3c0.pdf
    • https://static.usrfiles.com/ugd/e5a943_c7a1d6e52f15478c96e9fdb68c2f4d5b.pdf
    • https://static.usrfiles.com/ugd/0d2908_b90bdbe208a343f39639ec74fb5f455f.pdf
    • https://static.usrfiles.com/ugd/764aaa_f2922206ca9f430bb8c93293c2cb9391.pdf
    • https://static.usrfiles.com/ugd/cac9e4_d40b335ace5e4b448c4e008aa4e6bbc9.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/sowugimixadi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/belidunilaweduzerugexa.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/31323018178.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000607d.bin
bda1e257aceeaec1ac97c9dc6e183c5285c2ac414b8530113c08c52a118b3192
pdf-font-stream PDF embedded font (sfnt) at offset 0x607D 5900 bytes
font_01_sfnt_off0000749c.bin
aa070fbb4920061df78e6d38d828fb6cb3202e8f66b06d180a330926a0301ba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x749C 10520 bytes