Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c52f8fe9da16064…

MALICIOUS

PDF

98.4 KB Created: 2020-09-12 20:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ff383a8a323e3b338a3cf3d356aa6f SHA-1: af5f97787bfa88021fa2db39caafade6a2c4c4d8 SHA-256: 3c52f8fe9da160643beef17dd9df2e68a5e9ba345c3d83a1326292a86b4fd4a9
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating a redirector link to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous links pointing to external PDFs, many hosted on cdn.shopify.com. The document body contains obfuscated text and a URL that appears to be part of the malicious redirection chain. The primary attack vector appears to be luring users to a malicious site via a deceptive link within the PDF.

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.com/wb?keyword=the%20standard%20view%20of%20science
    • https://cdn.shopify.com/s/files/1/0428/3275/6902/files/plural_form_of_asparagus.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/32814396310.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.pdf
    • https://cdn.shopify.com/s/files/1/0440/7797/3654/files/the_adventures_of_sherlock_holmes_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6322/files/rugusawuzipobita.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9750/files/basegopuwilux.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vokoferu.pdf
    • https://cdn.shopify.com/s/files/1/0465/3986/6270/files/backwards_design_lesson_template.pdf
    • https://static.usrfiles.com/ugd/f459ea_07039108042f42bf9c96272046cb7825.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1e374d10a264b2bbbd3c903cc4ae942.pdf
    • https://static.usrfiles.com/ugd/2d1648_389b7b431ae8456fa2554a2bd9a8f81b.pdf
    • https://static.usrfiles.com/ugd/7f614e_b50ee2a55293443ba939d286a1a50602.pdf
    • https://static.usrfiles.com/ugd/5ecadc_4a327d25c03b4ae6ae327d30a736449d.pdf
    • https://static.usrfiles.com/ugd/01bc73_85e553c2ce584278b0b7549813e91bac.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_off0001483f.bin
bec13002087328847abbdbfcf4359c9c2ef27067731ac6d2d55cb8f93a64779e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 5176 bytes
font_01_sfnt_off000159ec.bin
516e186ce38b2736494c90943c70ba87d2ec0de1702ee5af63da21b198a4680d
pdf-font-stream PDF embedded font (sfnt) at offset 0x159EC 10112 bytes