Malicious PDF — malware analysis report

Static analysis result for SHA-256 7597e2963a3635a8…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 21:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47f76b5cb5f79d81e261885761023445 SHA-1: c01a9d4529aa4199c6e63a482be5bd0b0ce733c1 SHA-256: 7597e2963a3635a8632d2301b417da7554ac5f0e5be37e5a547378ff76cf7c95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body itself is heavily obfuscated but contains a URL that is also flagged as a malicious redirector. The presence of numerous links suggests an attempt to direct users to malicious sites, 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.ru/pify?keyword=probenecid+mecanismo+de+accion+pdf
    • http://files.gailshortwrites.com/uploads/1/3/2/7/132740553/felosidonokofo.pdf
    • http://files.jlsmither.com/uploads/1/3/0/7/130776661/3dd69.pdf
    • http://files.tackylightstoursrichmondvarva.us/uploads/1/3/0/7/130775866/19510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/samsung_s5_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76222514852.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/27572412538.pdf
    • https://cdn.shopify.com/s/files/1/0428/4658/4999/files/how_to_convert_cdr_file_to_format_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/harris_quantitative_chemical_analysis_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/72666809563.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/pibuvumiligonojopokaxenoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/60791420630.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/bilajakuler.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38030937597.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/advanced_awk_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/zimeburireperokoriniv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/kunoradojubewalavel.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_off000065d3.bin
f70dd2487bfb6e82c78d8382e2146f13c1b05e52e5112e1029992e276ea9519b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D3 5408 bytes
font_01_sfnt_off00007814.bin
498d9c926eaf9feb3ad06ee27bfa7c5767658aa9889521aa4462e5dbae6401eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7814 10384 bytes

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