Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d1f196fe3de002…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 02:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 766f84448992a088be6792a485ef2bbe SHA-1: 636f281b29e9deead698933efc1ff162291ed45f SHA-256: 08d1f196fe3de0027744f84afe9855a97d2252e449cf84a78fa98c7b0b1edbbb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the embedded URL is the primary indicator of 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/wix?keyword=kral+lear+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_bd8d0876f3d947519fe946455faedc36.pdf
    • https://static.usrfiles.com/ugd/b8c837_3457e671e6fb4533951ef01701bff528.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f598550e17d4b59a95388f01a911b41.pdf
    • https://static.usrfiles.com/ugd/b8c837_012eaa64d26d44bcacde788e94d234b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_961513ed11a54f2194b647a5079d600a.pdf
    • https://cdn.shopify.com/s/files/1/0437/8954/9726/files/92387838214.pdf
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/2714595490.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/arduino_uno_smd.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/22276211183.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/jobitizopapipuwajus.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/83244536061.pdf
    • https://static.usrfiles.com/ugd/b8c837_6284f60432dc49c2a809a8035327b542.pdf
    • https://static.usrfiles.com/ugd/b8c837_74f958602e7b405f9f6699054cc60f52.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be3f9a172cd4177b11731fd3b77c14b.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_off00007520.bin
79da888af1219121f9f13f6ed12318fe7a9175b9f80681d3db57599023803159
pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 4828 bytes
font_01_sfnt_off000085a1.bin
60ffd413ed9fa909cac46c28ae0be5868cb6c09d5911ecddaf66d33d1846e6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x85A1 10736 bytes