Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7ec0561798e6dd…

MALICIOUS

PDF

42.0 KB Created: 2020-08-15 02:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d29d32bd5712a7d7c6603e9c8a5e1192 SHA-1: 0864275df9c26f37e547cd1b2c23331b2f4a4519 SHA-256: cf7ec0561798e6dd7a46b9e0bf401473c5b7cdb257caded71f2216594c6d7604
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text referencing "Mental health first aid training manual" and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning and traffic redirection.

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/pify?keyword=mental+health+first+aid+training+manual
    • http://tupak.lillianchun.com/uploads/1/3/0/8/130874493/nevemaxur.pdf
    • http://files.gremassagetherapy.com/uploads/1/3/1/4/131437322/9be0eb97b9f88.pdf
    • https://cdn.shopify.com/s/files/1/0435/6620/3029/files/59566588233.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/biology_dictionary_english_to_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/xovitetitosifujuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/1839307549.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/wepexolafitadagitulatoro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/principles_of_accounting_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/ff13-_2_taming_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/ffxiv_armorer_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/rorotopazovig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2562/files/16715592318.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/90325945731.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/hyper_terminal_for_window_7.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/goxefiwevoxejitobufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/77476493177.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_off00006486.bin
bc00f1cff3562e43f901a61f1f4f116f3d4c94d866d2296d39abf13b745f346e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6486 5324 bytes
font_01_sfnt_off00007678.bin
450c819883b75e8eb095b56fb0d9f1614c76ffa4abd48516b29d8749f8cd406f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 10688 bytes

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