Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5a8b29c5721603…

MALICIOUS

PDF

44.1 KB Created: 2020-08-03 17:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b88a8d698ee6cfe1f346627062a93d0 SHA-1: 05b4478aa76aff5600fde9d0a6fb838b5f09016d SHA-256: eb5a8b29c57216037da47d09013aa5623721127c3ccd9fef3f728aefc6693a03
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=harassment+at+workplace+pdf', is designed to lead users to malicious infrastructure. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF 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/pify?keyword=harassment+at+workplace+pdf
    • http://files.padermpa.org/uploads/1/3/1/1/131164273/satuk-nifosetiwaxux-dexogupevofuwud.pdf
    • http://files.en.lflplatform.net/uploads/1/3/1/4/131409463/wizupofonaxa-nilipeboji.pdf
    • http://files.waterswheel.org/uploads/1/3/1/3/131379381/c3546f64984d7a.pdf
    • http://files.euroconferences.org/uploads/1/3/1/3/131380773/fupuxomejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/sazetevumure.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/28596697347.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/janekuviribajekapop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/93751055158.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/96839540077.pdf
    • https://cdn.shopify.com/s/files/1/0437/5085/0709/files/70951509810.pdf
    • https://cdn.shopify.com/s/files/1/0431/0361/7173/files/92310268220.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/47117788432.pdf
    • https://cdn.shopify.com/s/files/1/0440/5723/1525/files/32921018278.pdf
    • https://cdn.shopify.com/s/files/1/0438/2438/2114/files/subaretutide.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/ketazumonis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/33904657398.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_off00006ebc.bin
ac840ae64587728331dcfdb334675ab748441e80aabc21dfb1824e6932d7959c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBC 5416 bytes
font_01_sfnt_off00008127.bin
851776ae35e37ac686546f796d62722c54cbc3cf73dc1a849a78a00c33cea890
pdf-font-stream PDF embedded font (sfnt) at offset 0x8127 10124 bytes