Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3ca813b8d0fb51…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 07:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf1e7469d273d9be022f37260abf289 SHA-1: c8af7d6c5a2c400c3797af0bafa84d0c246b71e5 SHA-256: 6a3ca813b8d0fb517ab10c61c1fc82733ef31374f51c36a9e1f4ea79f60669f5
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded URLs, many pointing to external PDF files. One URL, https://ttraff.ru/pify?keyword=a%25C5%259Fk%25C4%25B1m%25C4%25B1n+beden+dili+pdf, is identified as a known malicious redirector. The document body contains garbled text but also includes the same malicious URL and a list of other PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of numerous links and the ML classification strongly indicate malicious intent.

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=a%25C5%259Fk%25C4%25B1m%25C4%25B1n+beden+dili+pdf
    • http://files.tri-villagetrails.org/uploads/1/3/0/7/130775897/varonamugagavij.pdf
    • http://files.steeplechasehomes.com/uploads/1/3/1/4/131453348/5119854.pdf
    • http://files.repeatinitiative.org/uploads/1/3/1/3/131379231/buvizuzokutesaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/pazopedisivefavob.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/wetavifijasanenovugamigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/zanosonixazexolalib.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/6776492991.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/rurus.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4869/files/pag_ibig_online_reg.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/wugivolagesow.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/superkids_teacher_login.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/17570598595.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/39562464197.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/tutorials_in_introductory_physics_homework_solutions.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_off000051e6.bin
e367ef3efa80c124f7f791b9527537fb6c08d99e3dd7e386fa97b29dad810278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E6 5176 bytes
font_01_sfnt_off0000637b.bin
90c42d0d05ad4eb6e1f6860b94436c2b082edda09db75eb7d21ceba696307ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 16216 bytes

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