Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14303cbe6322970…

MALICIOUS

PDF

57.7 KB Created: 2020-08-10 15:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46184c41dd9d693fa30992ff4ce0831 SHA-1: 93c454f895e63ad0e1da694ebc21f76d308e36e4 SHA-256: c14303cbe63229701a2af457f529d393101a22520db68a5bd8c2b842bca3ffa2
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, with a primary redirector pointing to 'https://ttraff.ru/pify?keyword=fundamentos+candombl%25C3%25A9+angola+pdf'. This heuristic, combined with the ML classifier's high confidence score, strongly suggests a malicious intent, likely to lure users to a compromised site or phishing page. No scripts were extracted, but the structure and embedded URLs are indicative of a delivery mechanism.

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=fundamentos+candombl%25C3%25A9+angola+pdf
    • http://files.greetersinternational.com/uploads/1/3/2/6/132681213/a5e656566ad2b30.pdf
    • http://files.mrtechyon.com/uploads/1/3/2/6/132681359/af06e.pdf
    • http://files.nathanrinehart.com/uploads/1/3/1/4/131455158/8311528.pdf
    • http://files.verticesglobals.com/uploads/1/3/2/8/132815872/jurowiwujetatexorefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/mibigenupufonenotekesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5159/files/nupalipopisijad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/jujitogej.pdf
    • https://cdn.shopify.com/s/files/1/0439/1724/6632/files/tamuvokomufuzujavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/kissanime._to_animelist.pdf
    • https://cdn.shopify.com/s/files/1/0435/3150/1720/files/28578113280.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3605/files/graduation_diploma_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/class_12_cbse_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/gugitelidamovow.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9647/files/duleb.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/catalogo_bujias_ngk_motos.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/79136752653.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/69382302475.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_off0000a0c8.bin
6eb5322e73e059ffacd4864c7bcba60c3b06604232da5d7c8c7888d478039bb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C8 5616 bytes
font_01_sfnt_off0000b38c.bin
c2c39e7bb43f40f52ee107f671d76df1c9d1897d7ef3cccc8fa8d48e8dae9453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 10568 bytes

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