Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb42959db67da8…

MALICIOUS

PDF

37.4 KB Created: 2020-08-31 06:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 327a4bcbdb2b3e81f5ae322e0c43d20a SHA-1: c8f497783b3ba11358dcd476e28b5fae22451df2 SHA-256: d5eb42959db67da8b2d7eda1818c8288423193aa8bfb11e63272fb43f83c2253
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, pointing to 'https://ttraff.me/wix?keyword=descargar+warcraft+para+pc'. This URL is presented within the document body, suggesting a social engineering lure to trick users into downloading software. The presence of numerous other PDF links, flagged as a link farm, further supports the malicious intent of driving traffic to external sites. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=descargar+warcraft+para+pc
    • https://static.usrfiles.com/ugd/b8c837_5ba32c53e07e478bb5d9789dcc64f4a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b921cfaf69c4d6ab3c0c9fec767e3f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3f3980ecb40432683dddd56453d5a04.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.pdf
    • https://static.usrfiles.com/ugd/b8c837_85b3ffb996b94c52bbb885da2ce8e4b8.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/mutisefaneginiden.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e178cdb969847e5933a8d0d38cee5e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_91436a01911e49eab3aeec83c749f18e.pdf
    • https://static.usrfiles.com/ugd/804ff6_a191ed6ea05b4597904a07b5317ed5f5.pdf
    • https://static.usrfiles.com/ugd/f0f215_6b4faf3c74de4bf98ceb839ecdb1cbab.pdf
    • https://cdn.shopify.com/s/files/1/0438/3296/7318/files/nasm_5th_edition_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3206/files/starbound_navigation_offline.pdf
    • https://cdn.shopify.com/s/files/1/0431/3094/5693/files/o_brother_where_art_thou_movie_script.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/budgetary_allocation.pdf
    • https://cdn.shopify.com/s/files/1/0437/2473/4613/files/ripajevegerojul.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_off000051d4.bin
d9909b4f46f5c92bfe0b1393215e30fe82dbbd6f2be18775c481c52b9cbf9043
pdf-font-stream PDF embedded font (sfnt) at offset 0x51D4 5244 bytes
font_01_sfnt_off000063d0.bin
c76e0a820c9d15f50eb85e52508df3e3b120173d0ad3f0a6a8183a71f9a752b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 10816 bytes