Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec8a4d07bfad999…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 14:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf7bba7937a10ee513213a8ccc50d94e SHA-1: 0a564fefb59e27b4ee1b749b75116b05de018e5e SHA-256: cec8a4d07bfad999ef53f0fd5688e4afc51df321de2819d39549cc5e9683663d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as malicious. The primary purpose appears to be to lure users into clicking malicious links disguised as legitimate resources.

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/pify?keyword=benefits+of+mindfulness+pdf
    • http://jivef.geoffx.com/uploads/1/3/0/8/130873951/bexopapaf_vudipa.pdf
    • http://xaluk.campusconnectsoftware.com/uploads/1/3/0/9/130969573/benobivobezexujanap.pdf
    • http://files.headstart-getcap.org/uploads/1/3/0/8/130874683/2299308.pdf
    • https://cdn.shopify.com/s/files/1/0429/6831/8105/files/homeostasis_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/dream_a_little_dream_of_me_piano.pdf
    • https://cdn.shopify.com/s/files/1/0429/6677/8009/files/double_digit_addition_and_subtraction_coloring_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/72159527169.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/speaking_in_tongues_scriptures.pdf
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/zumipozitile.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/72954173859.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/kemadukimibez.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/2571190945.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2689/files/islamic_banking_and_finance_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/99111070550.pdf
    • https://cdn.shopify.com/s/files/1/0437/3381/1351/files/peboxawiwokolutanar.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/islamic_banking_and_finance_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/9885631551.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_off00006d50.bin
be5769ba2e06ab398b1c00f556f6a6551d10c802015d732e3149ff6b4eeb6cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D50 4932 bytes
font_01_sfnt_off00007e0b.bin
938536dff3266f270536267d85e31bb64a8c35040c0319ab8a21ad549cc3c33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0B 9732 bytes

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