Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9deec18986dbc0…

MALICIOUS

PDF

54.6 KB Created: 2020-09-10 15:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 111df71e3657f747311d5a90321d6db1 SHA-1: 973ef29b60bef8f7b76548e642748c2cfd661adb SHA-256: 3b9deec18986dbc0d740e6afb90278a4dcbdb45ecba046257ba14bac8d3e8f0d
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 'ttraff.club'. The document body, though heavily obfuscated, contains the same URL and a keyword related to Android development, suggesting a lure. The PDF also exhibits a link farm behavior, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier 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/wix?keyword=android+auto+start+service+on+boot
    • https://static.usrfiles.com/ugd/2ac701_d52f712f1f5f4f1f8b42e349726a7811.pdf
    • https://static.usrfiles.com/ugd/5899d5_6ced9679c66e4f00ad01b71ba5141934.pdf
    • https://static.usrfiles.com/ugd/b5aed9_e691a0e82d3f41ff986b4c9a15543425.pdf
    • https://static.usrfiles.com/ugd/ce14f3_bbbccc51a66b428389a7dacef3b3e061.pdf
    • https://cdn.shopify.com/s/files/1/0437/0048/6312/files/best_action_games_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/cyanobacteria_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/bajujetulituvivenowoki.pdf
    • https://static.usrfiles.com/ugd/5bb01c_ec372bd9457e4b7684a74066ac56d550.pdf
    • https://static.usrfiles.com/ugd/bfbc46_4651de73a6804a2387bf5921e9f81930.pdf
    • https://static.usrfiles.com/ugd/856cea_d40b1601529d406fb17e1461b27c6c1b.pdf
    • https://static.usrfiles.com/ugd/33ab24_68ecf359c731437ea3be6c6574f4056b.pdf
    • https://static.usrfiles.com/ugd/d162e3_9455544824c2465293ab7b547310bcad.pdf
    • https://static.usrfiles.com/ugd/19103d_e6a7d56d748d46b7a890372d90ce1156.pdf
    • https://static.usrfiles.com/ugd/5bb01c_da6d786ab50c431c96694406ad5d72ae.pdf
    • https://static.usrfiles.com/ugd/cafc24_07d0330a7cef4fbe9f21d449fbb8ebd3.pdf
    • https://static.usrfiles.com/ugd/e4d7df_586008540f39424eb85a12d8ce9053e2.pdf
    • https://static.usrfiles.com/ugd/4cd51e_1b302d98a0904a3993d103067c0a0c04.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_off00008af2.bin
c55617d390ae8a521be8950228480e53481a24e918b2ab30828ef5b92a0587cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF2 5088 bytes
font_01_sfnt_off00009c4f.bin
e5d58322866b6508f821da4b3b6aab75b3b786723dc1438df2f297bfbcad8af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4F 15220 bytes

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