Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdddb01d640f22c4…

MALICIOUS

PDF

45.5 KB Created: 2020-08-12 16:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d826214bd5bfc92dc87616761dbb97da SHA-1: 6f281fcc0d56de0a971481c543809e312f1f85d6 SHA-256: fdddb01d640f22c4ea9939f8890a80ab64b9e43a04eb7373b970c97305bcb7ee
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The primary malicious URL is https://ttraff.com/pify?keyword=aphasia+treatment+activities+pdf, which is likely used to redirect users to a phishing or malware distribution site. No scripts were extracted, but the extensive use of external links and the malicious redirector indicate a delivery mechanism for further malicious activity.

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=aphasia+treatment+activities+pdf
    • http://womawaj.kikisboutiquexo.com/uploads/1/3/0/7/130738848/8731104.pdf
    • http://jonukezi.usafortunae.com/uploads/1/3/1/6/131636725/378a88554b034.pdf
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdf
    • http://files.stephenharrisonweb.com/uploads/1/3/0/7/130739833/taraganuxumuxuled.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/34059518609.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/lixoxuvewawemovemonuzojuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/mycenaean_pottery.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/biology_important_questions_for_class_12_state_board_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/deduwisawavetedozalivavad.pdf
    • https://cdn.shopify.com/s/files/1/0449/7843/8302/files/ielts_reading_test_academic.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/free_camisole_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/99863819869.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/guniw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/4870939995.pdf
    • https://cdn.shopify.com/s/files/1/0439/2307/9323/files/botanica_oculta_libro.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/vedugi.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_off000073ff.bin
020f72c8cca3b2380a5ccc430efff33c26c76fa6047e298d8ad2f2a34a88b9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FF 5412 bytes
font_01_sfnt_off00008642.bin
0a2a83c0bd9b99c7929e4bc0131c639604982f7c756bc1bd322b7f40b3d54bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 10248 bytes

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