Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9c88e5356e250a…

MALICIOUS

PDF

41.8 KB Created: 2020-09-07 22:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ba26edf952e75a6b4fec70aa89f05b5 SHA-1: b2afd28b047bbb8cf0cae0123b7dffd57456df0c SHA-256: 4e9c88e5356e250a279fc10b8b56c1e692aca284f69333d784555806537ac43b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'Adobe pdf online editor'. This suggests the PDF is designed to trick users into clicking the malicious link, which likely leads to further compromise. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=adobe+pdf+online+editor
    • https://static.usrfiles.com/ugd/b88e3d_2bcd284cf53e4b779879de7b1b881d27.pdf
    • https://static.usrfiles.com/ugd/73cb9e_ea235c36204342eb9f87893610c62ac5.pdf
    • https://static.usrfiles.com/ugd/7603ae_8c492fdf13d64eb08d87cb73bb4eaa5b.pdf
    • https://static.usrfiles.com/ugd/115d6e_2c0742676186468c8b78033f305381d4.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/46794429353.pdf
    • https://cdn.shopify.com/s/files/1/0433/7297/0133/files/badaguzanomomofotowuvuw.pdf
    • https://static.usrfiles.com/ugd/fc3b0b_261ca4dfc9844359a5986e17e89115c7.pdf
    • https://static.usrfiles.com/ugd/7d21c0_4da5a6ae4bbd455ea42f870730e41f85.pdf
    • https://static.usrfiles.com/ugd/824332_d6222b0689f94a40bb22eef5a18b551f.pdf
    • https://static.usrfiles.com/ugd/362633_adcb8ffc4f1147caa83fc2250a881664.pdf
    • https://static.usrfiles.com/ugd/17159d_9a35b87b0bc14daa955b28d24258da6f.pdf
    • https://cdn.shopify.com/s/files/1/0435/5194/8963/files/solutions_manual_for_calculus_a_first_course.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/13695245870.pdf
    • https://cdn.shopify.com/s/files/1/0428/6326/3910/files/molew.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/
    • https://cdn.shopify.com/s/files/1/0435/5194/8963/files/solutions_ma

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006501.bin
a3f035f2ae7348bad5e7bd2ca99cf87b274f958516a71e9e52a82c55d587ed2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 4776 bytes
font_01_sfnt_off0000754e.bin
8e7332b09b1b5f750bb8774fd755ca5e12ea522b70a58809aabedd65978f9617
pdf-font-stream PDF embedded font (sfnt) at offset 0x754E 10884 bytes