Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a3109d8c8247fb…

MALICIOUS

PDF

38.3 KB Created: 2020-08-22 09:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f7094b9dd3f42bf6ed2b7b0d080d3df SHA-1: 559f7e4f055ff4c4e29321ddfa24d55ea4cad316 SHA-256: 33a3109d8c8247fb9c3941383eb3ec624939ee4d7d9ff7a4c9d4148e902cf535
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=bangla+natok+new+2019', points to known malicious redirector infrastructure. The presence of a large link farm within a small PDF suggests an attempt to manipulate search engine results or distribute malicious content through numerous external links.

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=bangla+natok+new+2019
    • http://files.modernartphotograph.com/uploads/1/3/2/7/132741225/b7abf375cc.pdf
    • http://files.workingdogo.com/uploads/1/3/1/4/131406558/zexekawemilu.pdf
    • http://baromimi.randiandmike.com/uploads/1/3/1/3/131398091/numaninalobufit.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/pumagefeluxuromevexivinuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5015/3622/files/call_of_duty_psp_100mb.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/sadasazuvijefise.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/36030891245.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/90098723616.pdf
    • https://cdn.shopify.com/s/files/1/0439/2586/4603/files/appendages_of_the_skin.pdf
    • https://cdn.shopify.com/s/files/1/0440/3331/0870/files/93010518587.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/21597341898.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0263/files/wutezulew.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/bkat_test_study_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000496b.bin
de19ff68b45712835cbeb767dbdbfbb23eca1d65a148afe3f53c775fe16ff36c
pdf-font-stream PDF embedded font (sfnt) at offset 0x496B 5264 bytes
font_01_sfnt_off00005b7f.bin
b6db05b7e652dc5ce84b3c9195285b0d1607e8e357a40c7f8efa9f5b6029ff64
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7F 4304 bytes
font_02_sfnt_off0000694b.bin
dc5908da8a151f07a7946fa4a22a81f7df10bbfc73c1f055ab71e4b897e6fb48
pdf-font-stream PDF embedded font (sfnt) at offset 0x694B 9792 bytes