Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb8235d4d6f8c8d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 00:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8aa468971e036e6a4914309c6f469f4 SHA-1: 84b8655a779ab95d913518d91484d64b5cf7f6ad SHA-256: 5bb8235d4d6f8c8dec27ce921e3e2e751f388270cbbb5dd8eda16aaf4df8f2d5
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and text suggesting a lure for a motor manual. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute malicious content. 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.cc/pify?keyword=briggs+and+stratton+5hp+motor+manual
    • http://kisag.jharidingacademy.com/uploads/1/3/0/9/130969191/xitewaxipikili.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2429/2762/files/83910983026.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/64950456959.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/jutigati.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3243/files/android_tv_box_malaysia_forum.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/osrs_lost_city_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/derawedajuzenuzoragivuloz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/bridge_to_ielts_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0428/0467/4727/files/abakada_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/benuwavarudevez.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/12577575299.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_off000064b1.bin
dff95ea53e676e891523708f5d6f19418f45fabdcc7053eee2f1079fede562c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B1 5548 bytes
font_01_sfnt_off0000775f.bin
adba46d409757decaa9eb4e94855b85de15d6d9f3ace9c3b29e5cd3d9a237800
pdf-font-stream PDF embedded font (sfnt) at offset 0x775F 10216 bytes