Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7619c5a4c61c48…

MALICIOUS

PDF

60.7 KB Created: 2020-08-03 04:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d67ecaaae5984c24b6974be7d4591ecf SHA-1: 4c1b7010a083d8c2cf039f665d9f76984abb1491 SHA-256: 1f7619c5a4c61c481b506a6f0136fa8227327081a388fe8a211f9dde4a52a2bf
152 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.cc, which is disguised as 'Network plus practice tests'. This redirector likely leads to further malicious content or exploits. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=network+plus+practice+tests
    • http://files.eastgeorgiaservices.com/uploads/1/3/1/8/131856743/zitozun.pdf
    • http://files.yodaveproducts.com/uploads/1/3/1/4/131408100/dotorijawoma.pdf
    • http://files.wblbgsu.com/uploads/1/3/1/3/131383665/jatuzupuwukiluso.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/dapaxitifak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/cross_out_text_discord.pdf
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/hsrt_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/44135109343.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/minecraft._net_server_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9984/0921/files/livalufupebunotamasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/39770430269.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/59209070368.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/rulojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1801/files/68896496053.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/black_women_names.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/51341212553.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/xejewebex.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_off0000a347.bin
e63ebc7a35f8c32880d2c0d34c199c4c13691222480cf23484398ee94de522ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xA347 5052 bytes
font_01_sfnt_off0000b4a0.bin
80a2463cc22572b47cdc9dacfdfb9695863c60fbdaf612d6f26c4ba15d0b1ab1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 15344 bytes