Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3409609fdc47c7f…

MALICIOUS

PDF

45.3 KB Created: 2020-09-09 02:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75ba7e1c834cb0af475aa4effcffc00 SHA-1: 2f05cc4aa1a66749befe4f0e76c39b337c8d39ab SHA-256: b3409609fdc47c7f5eb4aa66cb744d8d81c117a040f34d102a5428becca93948
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=mamonde+sheet+mask+ingredients'. This URL is likely intended to lure users into a phishing or scam page. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as the primary lure. 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/wix?keyword=mamonde+sheet+mask+ingredients
    • https://static.usrfiles.com/ugd/3a38e0_4b9dda6401614cef88bdb901e992c50c.pdf
    • https://static.usrfiles.com/ugd/5bf82b_91eaffe55945426cb1e5d6330c9924b7.pdf
    • https://static.usrfiles.com/ugd/3d0627_8a143701b0544cd0966f24651892bc29.pdf
    • https://static.usrfiles.com/ugd/17159d_ef960bc59aab4e1c94d0a0a2f52d85b9.pdf
    • https://cdn.shopify.com/s/files/1/0461/5769/3091/files/jurnal_hernia_umbilikalis.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/detakovenosutejuf.pdf
    • https://cdn.shopify.com/s/files/1/0465/0228/1374/files/liditelasokoj.pdf
    • https://static.usrfiles.com/ugd/f1d680_6bd0bfd8d14644fb951af5c3a9b96ef5.pdf
    • https://static.usrfiles.com/ugd/b30cf0_78a184a6f9f3486dbf68cc47bcc05c1e.pdf
    • https://static.usrfiles.com/ugd/dcf311_ea013e8e22af4384a64deb414b2489e6.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/sekiro_fat_wax.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/to_latest_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0448/2406/8258/files/dna_replication_in_prokaryotes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000614f.bin
2b5d7eff8f879ee17e3acfdac45b98ad13010051746d36a27a243809fd56f040
pdf-font-stream PDF embedded font (sfnt) at offset 0x614F 5064 bytes
font_01_sfnt_off00007257.bin
c87bd87bf7680b4426858929d8b51b28e51d2c0d5a7c047701c9cce9aae3bbf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7257 12816 bytes
font_02_sfnt_off00009a4e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 4324 bytes