Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c8ada9487826db…

MALICIOUS

PDF

51.1 KB Created: 2020-08-08 10:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84c02469081a025c21b67ca011a20879 SHA-1: ab1ee8d7071bce938fd3706db414dea9f8533e16 SHA-256: 79c8ada9487826db266f5111be71dad19cfb021d08670d2dcc3771bd8c48a8e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests a link farm or phishing attempt. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wb?keyword=vymanika%20shastra%20pdf%20download, which is flagged as malicious.

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/wb?keyword=vymanika%20shastra%20pdf%20download
    • http://files.volleyalliance.com/uploads/1/3/0/7/130738896/a465649743.pdf
    • http://files.welwynwatches.co.uk/uploads/1/3/1/3/131383655/8380244.pdf
    • http://files.whistlepigsaloon.com/uploads/1/3/0/8/130874102/kodaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/sexuxofuzexababe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/tvpad_dns_servers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/59812124916.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/26006043323.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/kogulifizunirefum.pdf
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/guitar_scales_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/aashto_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/fejekutujazovuriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/vuzuwijaditefenetupowez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/78579916165.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/83750884766.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3090/files/61962921601.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/59116119315.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/britannica_encyclopedia_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c45.bin
539af679852145f254f018e18d47923ff14990246814a90ed716696003ba792e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C45 5504 bytes
font_01_sfnt_off00008eeb.bin
ce8c8eb11cb31fd9e198e9f6dd38aec08a693f20a63f1aabd671a0b84a1c254a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEB 10256 bytes
font_02_sfnt_off0000b237.bin
c8d555ae7417cf1afe265e81848efe9d51b80ebd7e3c3abad0624ea30b50aa20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB237 3336 bytes

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