Malicious PDF — malware analysis report

Static analysis result for SHA-256 531388c3a08904cf…

MALICIOUS

PDF

41.7 KB Created: 2020-09-02 00:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23ac105025b00968f6555df452afbc8 SHA-1: 62aac7ce7aa9e7ce3c973a7b810ec1168ef842dc SHA-256: 531388c3a08904cf4a3b1d16f98437f065448b739238b3da23f83f5faf1fea25
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 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify and static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is used to redirect users, likely to a phishing or malware distribution site.

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.com/wix?keyword=subaru+forester+2018+review+consumer+reports
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/hovercraft_design_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/tetezugidakomubetureb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/todos_livros_apocrifos.pdf
    • https://static.usrfiles.com/ugd/784815_6ec08dbae93b4d6ab0fac890a9a9733f.pdf
    • https://static.usrfiles.com/ugd/97368a_e7a790c1b7f244569b5504d1567c6afb.pdf
    • https://static.usrfiles.com/ugd/e2c250_e52cecee18cf40babe762d30684b7200.pdf
    • https://static.usrfiles.com/ugd/3794ad_290a54d9829a45ad9fc1312a36e69861.pdf
    • https://static.usrfiles.com/ugd/e643da_acdf9f3c835b488c9daa7032b08a4436.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/40609328338.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/geragefewatererir.pdf
    • https://static.usrfiles.com/ugd/9374a7_e6dff9830ea842958a22de233952ce5e.pdf
    • https://static.usrfiles.com/ugd/e3325f_21afde6ad9e84268b3a73365d0535970.pdf
    • https://static.usrfiles.com/ugd/3eed2b_7a31a4f451ea4912a96159dc45866bd6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bddf7b4514c247c1be2646bd05302187.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_off0000625a.bin
024ce3c762ed995beff735a83f15ba5a0c907607e06414bd14518f4cee743b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 6044 bytes
font_01_sfnt_off000076ef.bin
c2450bf5d9c41f338f683d01631625a268499068a7708715ae99956dfd91cfc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EF 10088 bytes