Malicious PDF — malware analysis report

Static analysis result for SHA-256 0693890d0b9f7ea1…

MALICIOUS

PDF

38.5 KB Created: 2020-08-22 08:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f8ddadb6af9b952009b9703fc97074 SHA-1: 42b31447d23a2df933810786d167ce6bba321cff SHA-256: 0693890d0b9f7ea1ab6cf31daf2e21032631b7abbfcf878f61312bac355fb36a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, appears to reference 'Dell wifi driver windows 10', suggesting a lure for users seeking driver updates. The presence of a link farm and the ML classifier's high confidence further support a malicious intent, likely for phishing or malware distribution.

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=dell+wifi+driver+windows+10
    • http://lojab.englishlearners101.com/uploads/1/3/1/4/131483492/vawupekam.pdf
    • http://files.fayolanaturalz.com/uploads/1/3/1/3/131381782/kupuwomubutas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/12366140474.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/bankers_adda_august_gk_capsule.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/berizikoviz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6319/7337/files/traumatisme_de_l_appareil_urinaire.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8716/files/tutorial_python_3._6.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/12320840939.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/90344764701.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_off000058df.bin
84043020b031885927d36abeb3baa1233bfc9400a5657a87ed14f0a9c76c939b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DF 5036 bytes
font_01_sfnt_off00006a37.bin
55174500058a580b7f7f0713fc5eefb3ed2ec8b285f21a4a656f74bc9bd2855d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 10360 bytes

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