Malicious PDF — malware analysis report

Static analysis result for SHA-256 c666ed8f0c07186d…

MALICIOUS

PDF

41.4 KB Created: 2020-09-08 17:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5f723e2636ea2bb3cedddc1554c736 SHA-1: a1df4abac9eea3affffeead4f0cf034f007a10d0 SHA-256: c666ed8f0c07186ddc634e22e41263ff1838eed22debd868e8241c7d2965283b
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a PDF link farm hosted on static.usrfiles.com. One of these links, https://ttraff.me/wix?keyword=video+helper+premium+firefox, is identified as a known malicious redirector. The presence of this redirector suggests an attempt to lure users to malicious content, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate user-facing content.

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=video+helper+premium+firefox
    • https://static.usrfiles.com/ugd/cb4a18_4c9e8689a5fa402fb0a3f07a732d0505.pdf
    • https://static.usrfiles.com/ugd/c63dba_289fecd1b7ba45248eaf39f13d7f8e40.pdf
    • https://static.usrfiles.com/ugd/dba42a_17247ec61f3b40baa60bd5166378b3ae.pdf
    • https://static.usrfiles.com/ugd/9421c8_f6e0bafaa9df43bd9650540aee90874a.pdf
    • https://cdn.shopify.com/s/files/1/0432/6765/3795/files/750086723.pdf
    • https://static.usrfiles.com/ugd/8acad3_7313df7b106548acb19af82cfa27fdc2.pdf
    • https://static.usrfiles.com/ugd/90c678_1cb6a66989984a309fc3bb7963891d1b.pdf
    • https://static.usrfiles.com/ugd/fd4c29_9d94f1eaa2ce48eba5c4eb6caabbeeab.pdf
    • https://static.usrfiles.com/ugd/289c5e_cc5820c7eee84c609565d70662c5e4de.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4151/files/gutavidigilemababajifuzat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6984/9246/files/sebivudisavomakile.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_off000060f8.bin
7a82150ae6184b0745d253a0800f82ef3959f10e445e79afbcd706e5e148dc52
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F8 4928 bytes
font_01_sfnt_off00007198.bin
6f105e8054476b9dd175c785f1ca01bfe96fd00feaf804c7de44af84dac2c336
pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 12824 bytes