Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ff90a640919c95…

MALICIOUS

PDF

34.1 KB Created: 2020-09-07 18:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e50e44ec9b8f93965c4845a0b264f0 SHA-1: 66c84547d257546b9c464dc1a8e0424c0f70af82 SHA-256: b5ff90a640919c95228007bce163e2f6d71ec525e31794aead31cd52c43563c3
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=youku+apk+for+android+tv'. This URL is likely part of a phishing or malware distribution scheme. The document body also contains this URL, reinforcing its role as the primary lure. The ML classifier also strongly flagged this PDF as malicious.

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=youku+apk+for+android+tv
    • https://static.usrfiles.com/ugd/e6092c_13b8d3bcbaae4b93bf1c401509786640.pdf
    • https://static.usrfiles.com/ugd/04c368_70c04bb7809f4b1d8d8ec0ab8d786b51.pdf
    • https://static.usrfiles.com/ugd/f5bc2a_b39b97895c4a4a68bb10d55013f64e39.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/muledesudeveg.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/aztech_homeplug_av_200mbps_wifi_extender_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/pukomedoxutipatozu.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_96ecb72dd7ab421493a4cb68e75e0ba9.pdf
    • https://static.usrfiles.com/ugd/80c1db_8c52363284e342f4923468f31a51c2cc.pdf
    • https://static.usrfiles.com/ugd/9f06f8_6275044301f0489abb0455ea443e0206.pdf
    • https://static.usrfiles.com/ugd/544c7e_a12d22e07c6446ffb613746afd1d5b46.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/youcam_5_v5.0.0909_preactivated.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/84218229256.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/52456677943.pdf
    • https://cdn.shopify.com/s/files/1/0463/6085/4683/files/84058065801.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_off0000484f.bin
2e5a5e6ee2e95c04e10606c1965a0b6261f2eb007c03dc7a3815fd6cb33918cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x484F 4908 bytes
font_01_sfnt_off0000591f.bin
710b61dd7119d830f2ebe3a8cb1d9c043ccb398d817580acfd7bb5b3d20e7e98
pdf-font-stream PDF embedded font (sfnt) at offset 0x591F 10128 bytes