Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2b3b8cb8fdcb91…

MALICIOUS

PDF

65.6 KB Created: 2020-08-20 20:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 363eb16bfdb47661b45e56e7ac11e7b7 SHA-1: 89838604cd3b18333918bf4930a1496c78133f5b SHA-256: 5f2b3b8cb8fdcb91eda858c15d87e9d3e45ac0727e32daa372b5d9931b3f890e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to distribute malicious content through a link farm. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button lure further supports a malicious intent to trick the user into navigating to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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.cc/pify?keyword=marshall+mid+anc+user+guide
    • http://dawuke.juliaremondini.com/uploads/1/3/0/7/130776769/f0568bcc51f8.pdf
    • http://folino.arthow-to.com/uploads/1/3/1/4/131452821/tasuguve-xatonudupop-jivalod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/59469664186.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/ncert_maths_text_book_class_6.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/nidafivuvowisininezafobup.pdf
    • https://cdn.shopify.com/s/files/1/0438/0521/2832/files/27402457783.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/vanogufagojewis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/shopsmith_mark_v_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/72337236474.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/refavepiwotumifedebek.pdf
    • https://cdn.shopify.com/s/files/1/0437/3040/3477/files/cleveland_browns_injury_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/ronidozizopovilalitodal.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/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bcc.bin
8b38fd2b858e4430c392a1c374de0d2d39d18d69d81e155c0d14f612cf526296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 8684 bytes
font_01_sfnt_off0000891d.bin
5a7a165315ca6eb5b745bd5dbd8f7b299ae811be4707556ceb96a6c62a10a19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891D 5052 bytes
font_02_sfnt_off000099fd.bin
538512be6c526ea957b587fa229624d829dca4873b622d187784a60d2c877fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FD 6640 bytes
font_03_sfnt_off0000ab9b.bin
f964389872db2844b05d478bb3397c337b43f303219e49fe46b3575210ac2882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9B 11220 bytes
font_04_sfnt_off0000d1a4.bin
cc86994599ca2b6bade3ef2a24080e5ca7d0105f80c2e61a4a6d43fb5994c661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 16684 bytes
font_05_sfnt_off0000e8c0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 4324 bytes

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