Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6118be01953b7c8…

MALICIOUS

PDF

36.5 KB Created: 2020-09-07 18:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb42ebdfc0eceb80ef8ad08bdd1e031 SHA-1: 545ed5658177c56a6f067a07475389da0f63c8ff SHA-256: f6118be01953b7c8d651013f93684e037952b2040b7880260806da1b469c1299
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=cross+elasticity+of+demand+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and a reference to a worksheet, suggesting a lure to entice users to click the malicious link.

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.club/wix?keyword=cross+elasticity+of+demand+worksheet
    • https://cdn.shopify.com/s/files/1/0459/6973/5847/files/21193412894.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/diguguvaran.pdf
    • https://cdn.shopify.com/s/files/1/0433/1051/4334/files/bengali_film_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/57070337833.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/57520769829.pdf
    • https://static.usrfiles.com/ugd/baa514_271a57614cd24261b1b5a74019ea02e4.pdf
    • https://static.usrfiles.com/ugd/04c368_ac978b2ee5b1401c9bea68aed6955237.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_9fabbd5a2e524bb0bc79442d619b23bc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0642/files/black_and_red_4k_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0463/0845/8661/files/compelling_conversations_japan.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0122/files/terminator_movie_300mb.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_off00004cda.bin
f8f7b5f8a15b06f8b890fda634b4554f85ef13258394184cd89a413818e6a8bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CDA 5424 bytes
font_01_sfnt_off00005f39.bin
461985a92072971adeb430edd3896d2107005951f85dc85e03fbace06341eb5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F39 10820 bytes