Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f868f1decfd8c1e…

MALICIOUS

PDF

64.1 KB Created: 2020-08-08 06:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33f3989019db5b6462017b2a226646a9 SHA-1: 16af75f70935e88ae22f27470b5be5edb8ea4a50 SHA-256: 9f868f1decfd8c1ea85a76cbebdb1caa52e5e8c20ce8da944f3fde735c73b6e1
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 pointing to external resources, which is indicative of a link farm or redirection strategy. The primary malicious link, 'https://ttraff.cc/pify?keyword=accountancy+project+for+class+12+pdf+with+gst', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a social engineering lure to trick users into clicking it.

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=accountancy+project+for+class+12+pdf+with+gst
    • http://tizopura.eyeholejig.com/uploads/1/3/0/8/130873995/rozemupuke.pdf
    • http://files.tuggerahlakesphysi.com/uploads/1/3/1/4/131453121/d3f76e28f1c8.pdf
    • http://files.racarons.com/uploads/1/3/0/9/130969448/libofog.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/amleto_garboli.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/76352642744.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/1411877369.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/ecology_class_12_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/antonyms_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/tuxavezutovipusowokuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/xilobux.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5055/files/93853157699.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/95667014409.pdf
    • https://cdn.shopify.com/s/files/1/0434/5364/4966/files/keto_meal_prep_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/fipunuwavaxuxuleluravo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/59439689449.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/73683249254.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_off0000badc.bin
8cce478117270bcc3a12b085d8a944e417db6ba50b75504857027aa2ef0c52ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBADC 5860 bytes
font_01_sfnt_off0000cef9.bin
4f5b4712dd496f09d33656c2cb197ad222342db746ed3a5b401ea184d75e6b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 10488 bytes

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