Malicious PDF — malware analysis report

Static analysis result for SHA-256 6845830c5de2cf5d…

MALICIOUS

PDF

50.8 KB Created: 2020-08-24 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0054db93c0e30cf16758b240e3dea2c3 SHA-1: 0af6d184208e11d3154fcd761035f8f8b5c7214e SHA-256: 6845830c5de2cf5d1736478dd9c4f2f323fc76bbb23e7b8ceb34063ba4a9e206
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including a critical redirector link to 'ttraff.cc', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'home rental agreement form pdf', indicating a lure to trick users into clicking the malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=home+rental+agreement+form+pdf
    • http://files.esuzanne.com/uploads/1/3/1/3/131379594/wuburepenu_supekafixag_rulotagakoreted.pdf
    • http://files.rightchoicesurrogacy.com/uploads/1/3/0/7/130740573/mituxax.pdf
    • http://files.nicolastrings.com/uploads/1/3/1/8/131871625/gumeloxoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/rokevakub.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3701/files/algebra_2_textbook_holt.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/71882574181.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/71243375044.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/44452303811.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/55491112796.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2166/files/76140621760.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a97.bin
11dec7355523b81e0d92affd8a427fc9adb8f6149edf38cb991651970df5276d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A97 5144 bytes
font_01_sfnt_off00009bfb.bin
07adc802f74a1d02f554a4b8a69480cf3eb366746cba2b04201a1cadb44083d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFB 10248 bytes

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