Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c04da8d0abe074…

MALICIOUS

PDF

38.1 KB Created: 2020-08-23 17:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 998515d955e628f1dd0658d040bb9a22 SHA-1: 99428628e5dba07c435e1ef8191b2f5d2617c8f4 SHA-256: 13c04da8d0abe0749b173f616daa81c4655f468b12dd3932778e506ab2f4c2bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text fragments suggesting it's a 'real estate guide'. The presence of a link farm heuristic further indicates an attempt to drive traffic to external resources, likely for malicious purposes such as phishing or malware delivery.

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=north+coast+real+estate+guide
    • http://files.colormeredpoodles.net/uploads/1/3/1/3/131380299/lirapivimugexurix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5603/7017/files/rebanedefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/97895448296.pdf
    • https://cdn.shopify.com/s/files/1/0433/4508/4574/files/fuvamegirevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/lewikiboxuvugamezejimamal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7920/files/anatomy_and_histology_of_kidney.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/mixepaxigetini.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/83382270694.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/fefetezetilawezugafatejoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/jobobefikugidev.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/33824275828.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/43144338272.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/ginixebogagewexazix.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053d6.bin
f86f735946bb726c278193f306678471aa8b982d34ff142b140aabe200ccfbfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x53D6 5172 bytes
font_01_sfnt_off00006561.bin
16f9afe35035b06a4b1a7d46231c1b48e5ac5f56c5012681847182f6430ba037
pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 11400 bytes