Malicious PDF — malware analysis report

Static analysis result for SHA-256 6856e0e4e84426c7…

MALICIOUS

PDF

44.8 KB Created: 2020-08-18 23:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcbd9908192ce6854b277cc936081792 SHA-1: efb9ebc2add8e4877af78559e350169f1650c408 SHA-256: 6856e0e4e84426c7c5115702dfe731544cdb5049d3a8afa8bbfaa9fea83bb0ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that likely lead to further malicious content or phishing pages. The presence of a malicious redirector suggests an attempt to lure users to harmful sites.

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.ru/pify?keyword=utmost+synonym+formal
    • http://files.katharinehamilton.com/uploads/1/3/1/4/131409677/1592718.pdf
    • http://files.allisonloehr.com/uploads/1/3/1/4/131453645/96a78b8.pdf
    • http://files.thebalancingpath.com/uploads/1/3/0/7/130776343/1203035.pdf
    • http://files.stanthonyschoolsg.org/uploads/1/3/1/8/131856257/rulukosonake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/79068904027.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/sotovimegunusopusanep.pdf
    • https://cdn.shopify.com/s/files/1/0444/4350/0710/files/31065591976.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzibuwusupamodugibeboz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/gizeto.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/29782461398.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/rilukitakoriporux.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6074/files/72580430174.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/the_casebook_of_sherlock_holmes_audiobook.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/zawelunaxonakijafezobu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7826/3718/files/a_deeper_love_inside.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f4.bin
470a89cacc8ad8b2665e6c2979b286091c649df517b069bf9d15403cbe342939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 4628 bytes
font_01_sfnt_off0000748b.bin
021ecef9ab8a67fefa2e7acbf275740662db5624b88c2f2fdf7edf42c9f70311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748B 10428 bytes
font_02_sfnt_off00009836.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9836 4324 bytes

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