Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f52c6523841d760…

MALICIOUS

PDF

44.3 KB Created: 2020-09-01 15:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d288000c38dce24134cf6182ac7afcc4 SHA-1: 4276f6cc7dcd1f5d4464cc889970ad6f95af683f SHA-256: 8f52c6523841d7600eacc01dd07a51a4ae34f2e736f64c629cea2e454aac66d7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=bakery+items+list+pdf'. This URL is presented within the document body as a 'bakery items list pdf', indicating a social engineering lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into visiting a malicious site via a deceptive link.

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=bakery+items+list+pdf
    • https://static.usrfiles.com/ugd/d9f7b5_32868aaccd2b4739bd07f4d57b2684c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6733231724be44e0b5452b979acb5e2c.pdf
    • https://static.usrfiles.com/ugd/9734e7_51564434fddf46658ccb98cdfe0fdfed.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c03e11b03fc4f46b2e3868bc0f208f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_17772981c6da43f3936d302466e8daf8.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0432/2374/4674/files/authority_letter_format_for_rubber_stamp_making.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/metric_system_worksheets_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0446/4757/9811/files/billie_s_bounce_alto_sax.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_7c56fd5e685f41218d88075cf115bbcc.pdf
    • https://static.usrfiles.com/ugd/2274a7_fd57ec4bfa11462296df56b2d7e06824.pdf
    • https://static.usrfiles.com/ugd/b8c837_216199422f274026a51ee88479231818.pdf
    • https://static.usrfiles.com/ugd/99965f_85d3f098a24b47bfb281a457653a0173.pdf
    • https://static.usrfiles.com/ugd/ade4e6_f1d9c89fc1394772a393b82d9664cb0a.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_off00006ece.bin
d9a14a906ab9d5bbc5a5aa568f117c61ffd17e31d8560a9f0e92d20e7cd90537
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECE 5404 bytes
font_01_sfnt_off00008129.bin
82bb8bb8a7f35f7ed8da04065b6d65b54c41d89e0fc36549b377fcc92b2c6327
pdf-font-stream PDF embedded font (sfnt) at offset 0x8129 10388 bytes