Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07652cf21955ed7…

MALICIOUS

PDF

65.9 KB Created: 2020-09-13 01:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3015d0f05fa0357ce25e284cf6b68c0a SHA-1: 3c54886e83a8221042b44b0a14cdb8ca20a9a19e SHA-256: d07652cf21955ed7a4ff97b7429128a82fe1a07174833e2a8e9c9e8573ac3f28
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.link/pify?keyword=english+grammar+tenses+rules+pdf+free+download', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users seeking free grammar resources. The ML classifier 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.link/pify?keyword=english+grammar+tenses+rules+pdf+free+download
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/exercice_appareillage_electrique.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/doropiraji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/wiresizekiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/javascript_ajax_get.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/android_7._0_easter_egg_cat.pdf
    • https://static.usrfiles.com/ugd/74e905_1628e3ee8817474a8a09f5e9695450d8.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/zafosudo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3577/files/django_url_template_parameters.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/manualidades_con_carton_reciclaje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4962/3462/files/zugonatukidudigule.pdf
    • https://static.usrfiles.com/ugd/d5415a_12d2999cdfa14040ad0c532744a435c7.pdf
    • https://static.usrfiles.com/ugd/cece23_a86265fecc944bd2b1032e5b335cbc53.pdf
    • https://static.usrfiles.com/ugd/4cd51e_e988f53920694f4a9d91cc7fa801ae96.pdf
    • https://static.usrfiles.com/ugd/9c58c5_3d0d9802fa904b588632f255fae96139.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_off0000b939.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB939 2828 bytes
font_01_sfnt_off0000c334.bin
0c001ef1189111323a3844cdf32e4f21ee68caf29398c27fa9ee1db114a797ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC334 5504 bytes
font_02_sfnt_off0000d5d9.bin
92beabca5655eb27d74dd54ab2577b4d13bd62ea2861c1d0eac2ad466f34c5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 9932 bytes

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