Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dc7bef0f39f8fc…

MALICIOUS

PDF

47.8 KB Created: 2020-08-08 22:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb20da41cf8d0ce65d11b334eb5cdb24 SHA-1: 327ea603b52f366515de4bf81fa52bb124d12a6f SHA-256: f5dc7bef0f39f8fcf079d06a94b61f36ff62a00ed32598ba161b0790f2f9060a
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.cc/pify?keyword=bass+guitar+scales+pdf+free'. The document body, though partially obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=bass+guitar+scales+pdf+free
    • http://files.hardycoaching.com/uploads/1/3/0/7/130774979/271975.pdf
    • http://files.xtremepaintbody.com/uploads/1/3/1/4/131409574/5723286.pdf
    • http://files.sass-and-crafts.com/uploads/1/3/0/7/130775384/xabowutegajojifik.pdf
    • http://fizinu.capitoloperarichmond.com/uploads/1/3/1/4/131437423/3492141.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/71427216095.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/98453638153.pdf
    • https://cdn.shopify.com/s/files/1/0439/0685/9163/files/alesis_dm10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/dozalinosefivomeruwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/95162884797.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/5441746111.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2849/files/demepedavuputatoweg.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5614/files/24935478170.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/50515926660.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/jozebigadiza.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/wedding_dash_free_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/3834/2311/files/bmi_calculation_formula.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_off00007cf4.bin
758103d61cb9138f27b1d83eb5dd137c9c92bd0aa292296d9ae4ce9038fcdbf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF4 5372 bytes
font_01_sfnt_off00008f49.bin
720be08756a6dbf635e1207fbb792c58d017d3ddae23a596ab4f04e1d2f7cdf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F49 10224 bytes