Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef6b76a1c1ec47f…

MALICIOUS

PDF

44.6 KB Created: 2020-08-29 17:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 693958c3426353c51e31610ab39e981c SHA-1: 0a36858c7df4098838546d21d01a41fd13d74b79 SHA-256: 5ef6b76a1c1ec47f92214c226f4f7bbf7cad4caaa1ebcbeed2742c6fc854eed5
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into visiting it. The presence of numerous other PDF links further indicates a link farm or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/wix?keyword=e+minuscula+para+colorear
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_33f7a0d5ae664733ae597ca6af8c47b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f5f02556bc54717b8328048df782305.pdf
    • https://static.usrfiles.com/ugd/b8c837_0bcdf6cb6138444387f37b9c07b1e985.pdf
    • https://static.usrfiles.com/ugd/10b11f_86f4ec0651504c6c91be4da5425508a9.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/tesazela.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/63388088199.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/encyclopedia_of_general_science_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/pixupuv.pdf
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/vikinone.pdf
    • https://cdn.shopify.com/s/files/1/0435/6879/1713/files/gureratupusomigebedejoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/63838288742.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/8157320493.pdf
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/notes_on_medical_bacteriology.pdf
    • https://cdn.shopify.com/s/files/1/0437/6333/5326/files/17222057126.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_off00006dfc.bin
fc76bd6bfa07a85dacbeb4e74b4e9afc3ad93b00c978d32c2f882844e9d7fd6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFC 5036 bytes
font_01_sfnt_off00007ef9.bin
2747fdcc76d5a74ef00b3fd38f6adb124dbc781aeb8bd24faed2b76295924c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF9 11512 bytes