Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5461b403711191…

MALICIOUS

PDF

45.1 KB Created: 2020-08-06 19:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c85168647adf4bb7e8bf56dee07d77 SHA-1: a6a31ca404cd168016460cfb0d6f3bce28f9fc14 SHA-256: 4e5461b4037111916c72ec2d664e3aeefbf027d983b05fe8f92e912f1cb02439
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised with a worksheet title. This suggests a phishing or social engineering attack. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO poisoning or link farm tactics to obscure the malicious destination. No scripts were extracted, limiting further analysis of the payload.

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.ru/wb?keyword=america%20the%20story%20of%20us%20episode%2011%20superpower%20worksheet
    • http://files.thecoderecords.com/uploads/1/3/0/7/130775134/5389704.pdf
    • http://files.internetadvert.net/uploads/1/3/1/4/131409508/xedulofidozo_jebisamus.pdf
    • http://files.gitchgear.com/uploads/1/3/1/8/131872105/mebovan.pdf
    • https://cdn.shopify.com/s/files/1/0436/2423/5170/files/85831657380.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1421/files/50022033397.pdf
    • https://cdn.shopify.com/s/files/1/0435/5224/3861/files/88338173204.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5840/files/cours_sur_algorithme_et_programmation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/31270269112.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/html_turn_off_autocomplete.pdf
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/sudasajiten.pdf
    • https://cdn.shopify.com/s/files/1/0434/6042/7928/files/69439410301.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/55852591956.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008949.bin
49e47685cb01d6e2372ce7a5b9d419900a0a0917a602fd43bf361796e5ab02c4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8949 18512 bytes
font_00_sfnt_off000052c8.bin
4763bb72bd9c8389aaa5537e834883333cea6e419a1397de387620313674a6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x52C8 5660 bytes
font_01_sfnt_off000065fe.bin
e74cd5732fb252b802f9533d1b3e29456b208099571d24d2c1add8f689d59304
pdf-font-stream PDF embedded font (sfnt) at offset 0x65FE 10272 bytes