Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31f5e0f14645dff…

MALICIOUS

PDF

40.6 KB Created: 2020-08-03 10:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e335d213bcd81c6de67d7a7162aa1d05 SHA-1: 6135f3d5accfe0bc09aa475295f977a24e507b20 SHA-256: b31f5e0f14645dff8f26bc12423d6a4a6060ea94ae9fbb5e86cb0bee80b584ee
154 Risk Score

Malware Insights

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

The PDF contains a lure related to a fishing report and embeds numerous links, including one to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the malicious URL, suggesting the primary purpose is to redirect the user to potentially harmful content.

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/pify?keyword=reelfoot+lake+fishing+report
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://files.wouldgodmilkagoat.com/uploads/1/3/0/9/130969237/xitisewatob.pdf
    • http://files.crabbymama.net/uploads/1/3/1/8/131855992/181697.pdf
    • http://files.cliftontaxicabs.com/uploads/1/3/0/9/130969241/xegosubof.pdf
    • https://cdn.shopify.com/s/files/1/0434/2585/7703/files/naruto_classico_epis_c3_b3dio_170.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/77904343441.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/xadawusafesofudub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/89743185434.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/47828649362.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/45973218656.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/mojumesogitesifiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/80044692268.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/88252053369.pdf
    • https://cdn.shopify.com/s/files/1/0436/5628/2265/files/15748816502.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/tejobipediresul.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/75931473935.pdf
    • https://cdn.shopify.com/s/files/1/0432/8131/8056/files/senut.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/58637574422.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/91223909948.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_off00006226.bin
ba0dd134323fe241155a14291967a6bb10af7b49ed3bfef8e010b09776f6f674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 5232 bytes
font_01_sfnt_off000073fc.bin
3dd1bdfdf67e2ae779355e19326507e6f69b2dfcdb4d68189a1e9225b89cf519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 9696 bytes

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