Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dd7b748e8816fe…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 21:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384fc07c4a54709cf982fbc50e7d984e SHA-1: 3b77de48da3a280a3d3a450e9246a107c6044d35 SHA-256: b7dd7b748e8816fe979cb0739103f18de75f549a5949aac49e2f6f46e96a6629
152 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'Honeywell t4r wireless thermostat manual' and embeds a large number of links, many pointing to external PDF files. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be SEO manipulation or a link farm used to distribute malicious content or redirect users to phishing sites.

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/pify?keyword=honeywell+t4r+wireless+thermostat+manual
    • http://zetade.mariettasquarefarmersmarket.com/uploads/1/3/1/0/131070382/fajoxomejajej.pdf
    • http://files.thecactusroom.org/uploads/1/3/1/6/131637271/nebefetike-biginenijan-xodipejopox.pdf
    • http://zuzusit.maryzambello.com/uploads/1/3/1/6/131606666/8190874.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/mapa_provincia_almeria.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/4699599230.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0072/files/84262966796.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/xikukafumijomaxulosu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/duboruzetejejomed.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/bemigulamujutizekosafi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/45304152516.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/as_catacumbas_de_roma_minhateca.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/bleach_episodes_366.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/lsat_logic_games_bible_workbook.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_off0000607e.bin
dc9fd838e5f5848f13c48cef6c572d844fd00f1959a73d2e40bee3bf74d5bab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 5168 bytes
font_01_sfnt_off000071fa.bin
446cb5e3b3c713e6bb94ca7a3c7be1aaa99fb8304dacd5281fc145e72929fd7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x71FA 10376 bytes