Malicious PDF — malware analysis report

Static analysis result for SHA-256 542f32e929efd94c…

MALICIOUS

PDF

46.4 KB Created: 2020-08-24 03:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b782d4479162f1fba0ef52256837cacb SHA-1: 4e0edad0429c8b1606d7e379c938344f4a02a5b4 SHA-256: 542f32e929efd94c128c513e9918b8cba26162787cddcf1d156d0a0eef07304f
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'logarithm examples and answers pdf' and a URL pointing to a redirector, suggesting a lure to a malicious site. The presence of many links to benign Shopify PDFs alongside the malicious redirector indicates a link farm or SEO poisoning tactic to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=logarithm+examples+and+answers+pdf
    • http://muwaro.cmmlibrary.com/uploads/1/3/1/1/131163725/1fc8eb08cd23.pdf
    • http://files.propertopper.com/uploads/1/3/1/4/131438843/sevefololobupoj_zikijaxijubux_pisur_fipeked.pdf
    • http://dexidoro.isolahandmadeoriginals.com/uploads/1/3/0/9/130969521/4480132.pdf
    • http://files.suewilliamsart.net/uploads/1/3/0/7/130776103/2d1cee14011c55f.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/electro_tek_multimeter.pdf
    • https://cdn.shopify.com/s/files/1/0449/3633/1419/files/cebuano_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/manual_de_microbiologia_veterinaria_vadillo_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/real_usa_address.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/mocha_js_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/povulubasenifetemubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/antibiotik_amoksisilin.pdf
    • https://cdn.shopify.com/s/files/1/0459/9349/2639/files/76652848004.pdf
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/21075297733.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/dreamweaver_latest_version_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/android_autofill_hints.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_off00006c3b.bin
4f8036347a8a9805b53a00fb45d1f93fae4e4d55f5aa4d94f33885f9963d2b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3B 5556 bytes
font_01_sfnt_off00007f18.bin
781e1ae08df731682222d9645ce2d6a921d7acf9f513f74a8057e45a778f1165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F18 14356 bytes

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