Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a0030172ab9d9…

MALICIOUS

PDF

51.4 KB Created: 2020-08-31 14:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fabd3e7e88fb6aa474246cd31b291c13 SHA-1: 9ccbbd709353d08b15d02421bdd39f7c4b803823 SHA-256: fb8a0030172ab9d98d5db3aede18e61af299a40a84f57f10a1f17e237b3fed88
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is disguised as a search result for 'cloudformation template application load balancer'. This suggests a phishing or social engineering attack aimed at directing users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

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.cc/wix?keyword=cloudformation+template+application+load+balancer
    • https://static.usrfiles.com/ugd/8d0191_57f14b0472014c75a7a2511263a6b217.pdf
    • https://static.usrfiles.com/ugd/097bd5_1bc7a4184c7942fdbd4cddda4b8c8bbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba8a2f2db8b14466b97b3b22b514a429.pdf
    • https://static.usrfiles.com/ugd/b8c837_044e78700e9f47cb857e1dc0d1e58284.pdf
    • https://static.usrfiles.com/ugd/cc03df_f482be4f80234b3d8564de1c108df681.pdf
    • https://static.usrfiles.com/ugd/921909_42a56891dc364c4ebd3ab75b866b7759.pdf
    • https://static.usrfiles.com/ugd/b8c837_63db309ca489412aae57794db5742f13.pdf
    • https://static.usrfiles.com/ugd/286fb8_90f7e114b9464aebbe2f0bc1ce42d1fe.pdf
    • https://static.usrfiles.com/ugd/1d64af_17052a7b597545d2897a1aed1b5fefb3.pdf
    • https://static.usrfiles.com/ugd/b4a829_36cd2a7163c641ee80576169d1bf99e7.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/university_admission_essay_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/2566/9028/files/kifevebakewolisewuxadizo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/61831175725.pdf
    • https://cdn.shopify.com/s/files/1/0428/7961/5142/files/ghost_town_dj_my_boo_mp3_download.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_off00007dd3.bin
09109cafb294ee55e6c85fde50581b2b52b89376a18aa96c30545c452b5c9139
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 5168 bytes
font_01_sfnt_off00008f44.bin
4321b4f4f29a7a68970b8a01891ef5c5c4cbd928981867eefe014e4ee4a1669d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F44 15520 bytes