Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f9f988f0ff93a2…

MALICIOUS

PDF

48.4 KB Created: 2020-07-28 06:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7c10cf3bac6ba2c9b68839c5ef5cbe9 SHA-1: 202fda819bbe3b0a180fe63cf47ebd60c5078e7d SHA-256: 09f9f988f0ff93a2265ffe5f48b6ba3f810a20eed238d9300b33649f02cc8268
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. It also exhibits a PDF link farm heuristic, with numerous external PDF links hosted on platforms like Shopify. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and likely contains lures, but the primary malicious activity observed is the redirection to potentially harmful URLs.

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=air+pollution+poster
    • http://files.myebrexperience.com/uploads/1/3/0/9/130969633/lubilowujo.pdf
    • http://files.russianspoon.com/uploads/1/3/0/8/130874369/8060980.pdf
    • http://files.eichas.net/uploads/1/3/0/7/130776081/5987844.pdf
    • http://files.sarahdronfieldproofreader.com/uploads/1/3/0/9/130969179/4442322.pdf
    • http://files.mysticplanet.shop/uploads/1/3/1/4/131483279/d001ba70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/76145003311.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/wusupixedilanivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/24883652598.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/fedinobeviretefifuzimun.pdf
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/79262415303.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/nubimutifudifuvowosumerux.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/60471833056.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/14000149915.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/toketinowane.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/22426548333.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/birukurigodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/jaxojigoxoxi.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_off00007a7e.bin
4cd776ca0a3fb955826cbc7947fd580855896f6a845a8fe63e24d1d66e211e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 4472 bytes
font_01_sfnt_off000089b7.bin
d61c71854b365bdd41cc138ea2a56774d1ecd617ee22f25f22b5dccaabd8ee31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B7 13456 bytes

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