Malicious PDF — malware analysis report

Static analysis result for SHA-256 323f86c7838df6a4…

MALICIOUS

PDF

38.4 KB Created: 2020-09-06 20:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9dd89f778b9ecb9181d41d49cb08bdb SHA-1: 06d7ec0b16138b7d882ffc297840877e3e8d7cab SHA-256: 323f86c7838df6a4400ec5f60e283e5bb2dbc2f0b5fc0173f6e13c0dcb73858e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is designed to lure users into downloading potentially malicious content. The document body, though heavily obfuscated, contains the target URL and keywords related to game downloads, suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.club/wix?keyword=street+chaser+game++apk
    • https://static.usrfiles.com/ugd/b7082a_56500dc114e4453ea06c2ebc2c26bb51.pdf
    • https://static.usrfiles.com/ugd/58a813_67737138341e4717ba52fbeb12178397.pdf
    • https://static.usrfiles.com/ugd/c5d40f_97092a039df74414965d4630d971cc33.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ab6f62e8e2e41b5bbe52e324fcbac65.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddcf71396a3c463a99180d85e72960ff.pdf
    • https://cdn.shopify.com/s/files/1/0434/3362/3708/files/dropshipping_2019_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0358/files/abb_surge_arrester_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0463/0645/9810/files/99563593985.pdf
    • https://cdn.shopify.com/s/files/1/0432/1918/9915/files/banshee_season_1_episode_6_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/80840935965.pdf
    • https://cdn.shopify.com/s/files/1/0433/1945/9998/files/gunav.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5157/files/5640928033.pdf
    • https://cdn.shopify.com/s/files/1/0457/0031/7340/files/aalwar_tamil_movie_audio_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/janavuraxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/kesametinikuxepamamun.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_off0000571a.bin
b518e7364e7192445a771e5969e204ab0f19504ce745821e25c795307a6da512
pdf-font-stream PDF embedded font (sfnt) at offset 0x571A 5480 bytes
font_01_sfnt_off00006995.bin
74760eee1dbbbdea5cc5cf3f611b25017e68aa0de87b5df53c124abbcbe5e07b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6995 10372 bytes