Malicious PDF — malware analysis report

Static analysis result for SHA-256 8834f94d6df64ee4…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 09:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a50c73b8c29f3b6a6888de835defbb3 SHA-1: b1e29878b836ee6f10a3259afccbf4e3d4a5167c SHA-256: 8834f94d6df64ee4c3ed093bbaed54ac8d77e2a187b5abf7458bdd7fb8674024
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The presence of a 'download button' lure further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

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/wix?keyword=averta+black+font
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/abruptio_placentae.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/35734965120.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/39884434004.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6195/files/86030248082.pdf
    • https://cdn.shopify.com/s/files/1/0462/2689/9095/files/bgv_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/6779/1765/files/argenta_pivotica.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/dukujimidugetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/zuwebigijipemigunoxaxatu.pdf
    • https://static.usrfiles.com/ugd/895bef_b8e573c8174b415fa73ef0c48fc002ef.pdf
    • https://static.usrfiles.com/ugd/1df9ea_53717cf971844dc38e11e7515d382c38.pdf
    • https://static.usrfiles.com/ugd/7f16bd_91fea8f621c74da1bc2541f94f0f294a.pdf
    • https://static.usrfiles.com/ugd/61f964_ceb0149b09b24fc5953fbab298efbc19.pdf
    • https://static.usrfiles.com/ugd/0d089b_bc40201fe9da4bbea28845ae4cb10bfe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/75568242675.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/66858835234.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b72.bin
44bd3d6d692638cfdc36d5d0e8ca04149f4b811dc1a006a8a6eae8f9ec69821c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B72 4952 bytes
font_01_sfnt_off00006c68.bin
c33d4caaab043316af4399cf24ef0c6c53cdb4b0c7e1fc565476c6f363ef9b67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C68 13072 bytes

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