Malicious PDF — malware analysis report

Static analysis result for SHA-256 9991ddbf11982f85…

MALICIOUS

PDF

36.8 KB Created: 2020-08-29 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb86e9362f9924298ac15a5d496f5a50 SHA-1: d6d4c2a192b8d1f35fb066c3de9fa8316befcd26 SHA-256: 9991ddbf11982f853fb01aae174d176b98b0957997201b04b74f95d71c8128e6
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=skrillex+bangarang+mp3+download'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to a potentially harmful site.

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.cc/wix?keyword=skrillex+bangarang+mp3+download
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/yahoo_dictionary_taiwan.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/health_inspector_reports_alberta.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/10524259824.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/wordly_wise_3000_book_8_lesson_12.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/kigegugalifexuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8310/files/vovif.pdf
    • https://static.usrfiles.com/ugd/b8c837_f85d765a816a4ec080ce057d9bc9f162.pdf
    • https://static.usrfiles.com/ugd/b8c837_81b48788db024d088584af02255238f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e85dd171fe154ea7a1a64fa96965ea2d.pdf
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/cursive_alphabet_chart_with_directional_arrows.pdf
    • https://cdn.shopify.com/s/files/1/0435/2724/1879/files/kiefer_swim_fins_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6570/4599/files/kipizanujixubazutatirej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/cours_automatisme_grafcet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/73318814698.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_off00004fe2.bin
ad23a16be8083f7260eda4acaada01db3e0f1ef5e057b32028a133fd56829f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE2 5732 bytes
font_01_sfnt_off00006358.bin
ba556cfdae9965dd6a0267d1c5f79397fee3f352c0d50d28093fb260b7d869cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6358 10308 bytes