Malicious PDF — malware analysis report

Static analysis result for SHA-256 5175853aaed2d076…

MALICIOUS

PDF

36.2 KB Created: 2020-08-14 08:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2082c325c6fb10bb2e24b2e7370cb207 SHA-1: 97b43fa5f83bb245ad2bb8395a5e18e8aa30edaf SHA-256: 5175853aaed2d0764bcc8afaae5c343d5aa50e24bdedcb021336cb4d171d334e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, likely as part of a link farm or SEO manipulation scheme. One of these links, https://ttraff.com/wb?keyword=glow%20worm%20micron%2030ff%20manual, redirects to known malicious infrastructure. The ML classifier strongly supports the malicious nature of this document.

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.com/wb?keyword=glow%20worm%20micron%2030ff%20manual
    • http://files.tayahanson.com/uploads/1/3/1/4/131438839/86b5c32b995.pdf
    • http://files.tumakbosports.com/uploads/1/3/2/7/132710654/150f27e066.pdf
    • http://files.pickleball-germany.net/uploads/1/3/1/3/131381658/niwewimofemoje_dosesuxinijud.pdf
    • http://voduzoko.jimcohenjudaica.com/uploads/1/3/2/8/132814930/jusatobidolaborut.pdf
    • http://files.storyclothdatabase.org/uploads/1/3/1/4/131483083/sutakirufaba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/sowivawimiramudem.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/derarazukanazameka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/ropoxewop.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/bk_murli_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/sagevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/juzegawoxuxazulolesim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/84898252679.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavokalozetaxolemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/jivavodoriraxatasosub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/25774957479.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/78664936634.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/xokibokezutanisomukexuded.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_off000050f2.bin
5e01a57adb97ffc61d373d93ed2764bda3468dd61e56ac8d859b27814ab44d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x50F2 5276 bytes
font_01_sfnt_off000062d9.bin
318483bc7dd88bf485e19cfaccb905e99314fb3ffc7b19a3f5b4f8bd4a85a8a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D9 9708 bytes