Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfef77f3f50f932f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-07 22:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a053eea363616c8795ff9bc81a37032 SHA-1: 2f7bf9adbf52f4fc9ea72618c82e2bb8ad8bace9 SHA-256: bfef77f3f50f932f53c1dd5862f14bf26f94babe75fec70d312292622fa86b03
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a PDF link farm heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and several other URLs hosted on Shopify and other domains, suggesting a link farm designed to distribute malicious content. The primary malicious URL is https://ttraff.cc/pify?keyword=metabolismo+de+los+lipidos+pdf, which likely serves as a redirector to a malicious payload.

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=metabolismo+de+los+lipidos+pdf
    • http://kopox.ccmelville.com/uploads/1/3/1/8/131856543/43776.pdf
    • http://files.catherinetran.co/uploads/1/3/1/3/131383791/pilipom_direvi.pdf
    • http://files.southplainsgentx.org/uploads/1/3/1/4/131483955/timevujetegileno.pdf
    • https://cdn.shopify.com/s/files/1/0434/5269/4680/files/wuzaligomiparujowit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2634/files/pdf_file_download_using_php.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0940/files/pioneer_bluetooth_adapter.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/28166226777.pdf
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/julanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/kaxupawelarode.pdf
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/52969352560.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/regrouper_deux_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/least_squares_approximation_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/amplitude_modulation_matlab_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/8429/9936/files/trebuchet_ms_font.pdf
    • https://cdn.shopify.com/s/files/1/0434/6626/0642/files/97251045678.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/folavikitaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/vafalokiwijukekopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9426/9333/files/65927077038.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_off00005a35.bin
dc72ca44681e141fc86edd9d732ac53c5c6ad52ed76083d584d3f303db4520d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A35 5236 bytes
font_01_sfnt_off00006bf8.bin
eaa9927da3faa45772c4ad0d48a8a382e3577f27cba940e12ea4ed38589cd2bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF8 10784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.