Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f20731a76c0c17…

MALICIOUS

PDF

41.5 KB Created: 2020-09-01 12:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7571a21645ce231c0628949291a90851 SHA-1: 35d8f2df265e2d0871cdd5bce05c3c65fa27e0a4 SHA-256: b3f20731a76c0c176dfbc83eab64a40bb6258aada93eda64be73dc7c4662e02e
128 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download button, intended to lure users to a malicious site. The document body, though heavily obfuscated, contains the malicious URL. The PDF_MALICIOUS_REDIRECTOR_LINK and SE_DOWNLOAD_BUTTON heuristics confirm this malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adobe+audition+2019+bagas31
    • https://static.usrfiles.com/ugd/b8c837_59834c2a1a414350b3743a2265d0773f.pdf
    • https://static.usrfiles.com/ugd/4cf28d_41ab93fad1394f66b22656f7049ff101.pdf
    • https://static.usrfiles.com/ugd/538d67_04ac7e909068400db71f7173ab265b5e.pdf
    • https://static.usrfiles.com/ugd/15cd4d_0fa90d1754ae44ffb562298063f7a142.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4399/files/gate_2020_syllabus_for_electrical_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/weekly_hourly_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/winrar_64_free_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/anemia_ferropriva_usp.pdf
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/emotional_intelligence_book_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/95957330819.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceefa6617de046cab9af5e0a9b652215.pdf
    • https://static.usrfiles.com/ugd/1e8759_41b03a5e9fba45a8a0ce5196f82d3ca1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c24447d30b8c47828084a64ed750a70b.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_off00005e9c.bin
b8677aac24e9e9efae8bf7d167900f33001ef8bc87feb41db991fcf516f393bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9C 5640 bytes
font_01_sfnt_off000071dc.bin
f355a8a877669cc45baa582e44d17180918e4d32acb55a5f1608156398e327fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 12404 bytes

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