Malicious PDF — malware analysis report

Static analysis result for SHA-256 037a7ef87bb8c4b8…

MALICIOUS

PDF

42.2 KB Created: 2020-09-05 00:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d3bd1289ebbacbf0bcf410fc9c607aa SHA-1: 7135bd9ddf42e1f5acb83ec7369de564c3139cf9 SHA-256: 037a7ef87bb8c4b82cae78fe2eeb6920472f4fc83a29bec625280b921e7000c1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=arciform+pattern+definition, which is likely intended to lead the user to a malicious site. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting a compromised resource.

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.me/wix?keyword=arciform+pattern+definition
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a43ec6_82be1a967e6c49aa938d75b8f249685e.pdf
    • https://static.usrfiles.com/ugd/921909_74154444967044bdabb646ab4133e3ac.pdf
    • https://static.usrfiles.com/ugd/c5d40f_5e323a5a590e4cffadaae1fc2c2b995b.pdf
    • https://static.usrfiles.com/ugd/0f1814_613e53cf90ff4299ae761e98714db2d2.pdf
    • https://static.usrfiles.com/ugd/bb13a2_e664755a3c6d42aa9578cbf188f6cef3.pdf
    • https://static.usrfiles.com/ugd/04e6f9_cdf7aed852174553829659ac3646d2e1.pdf
    • https://static.usrfiles.com/ugd/cac9e4_49087ef06b0740dd9f0a6d1287e46fa6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdf
    • https://cdn.shopify.com/s/files/1/0431/4641/2188/files/21885655786.pdf
    • https://cdn.shopify.com/s/files/1/0437/7424/7069/files/zagaminowisijodisamavudi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1358/4542/files/30514939292.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/32965441849.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_off000067ec.bin
4a0a297d5d3281078523eebf42be5387809071a21b524f936de7bb712c758320
pdf-font-stream PDF embedded font (sfnt) at offset 0x67EC 5080 bytes
font_01_sfnt_off00007921.bin
7524325afce4f491f874fd06ec1d75f4cdaa7668ed3e8938994720c94a845383
pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 10336 bytes