Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37b3609b96160e5…

MALICIOUS

PDF

37.3 KB Created: 2020-08-15 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec47ebf88334b59561e90c80879941e2 SHA-1: f11a1ee3d94972cc814c8f7462ebc844be9f61de SHA-256: e37b3609b96160e5a8910660cb85601f869a359d5728f0c40f2f3a3708aea4af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains a URL that matches the redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, some of which are confirmed benign but others are unknown or potentially malicious. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=manual%20changeover%20switch%20connection%20diagram
    • http://lumoxotav.matthewdines.com/uploads/1/3/0/7/130776687/82fe6.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/tamil_baby_name_list_in_tamil_font.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/48550608032.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3429/files/math_sl_formula_booklet.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/descargar_aplicaciones_para_android_gratis_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/targeted_malicious_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/6634/3072/files/chilton_labor_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/22852039593.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/doburigedesetapit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.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_off000053a5.bin
cddd9c5c8a350c8477287fbf39715b863d65702fdbdf7af5a132bcbfcd108c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A5 5508 bytes
font_01_sfnt_off00006644.bin
8cf80668d5816134ad665bfb19b3d8c9e5b775f619cc48187cf413087733e42d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 10044 bytes

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