Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9b17afc15dc340…

MALICIOUS

PDF

49.3 KB Created: 2020-08-17 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28365768b761f1ef310650be1602202c SHA-1: 0549a46f8474bf631b609ada77dab4fe11c5cf3e SHA-256: dc9b17afc15dc340107f3273939e859423206c1cacf7b7145650aa0ea0c1c1bb
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one to a known malicious redirector at ttraff.com. The document body text is garbled but contains the lure "Occupational health and safety textbook pdf" and the malicious redirector URL. This suggests the PDF is designed to trick users into clicking malicious links, likely leading to further malware downloads or phishing pages.

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=occupational+health+and+safety+textbook+pdf
    • http://wunafor.tierraburns.com/uploads/1/3/1/4/131437987/edf0f20ff240.pdf
    • http://files.alanhuckleberry.com/uploads/1/3/2/3/132303001/wotadoxekevakug_kunovod_nubibekugaw_lugusepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/donobemew.pdf
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/free_online_historical_romance_novels_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/23695322588.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/76631375485.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2066/files/dotiraduseva.pdf
    • https://cdn.shopify.com/s/files/1/0428/6103/5686/files/logical_reasoning_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/calculus_one_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0451/4054/1593/files/sociologia_libro.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/38172827569.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/36733027146.pdf
    • https://cdn.shopify.com/s/files/1/0431/9032/1313/files/nuvulesexob.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_off0000833d.bin
80b6c9c9a577e2d66eb42bbce1229dfb385a489c5d4a9abda709d7e838864fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x833D 5548 bytes
font_01_sfnt_off0000961c.bin
5bc9dbb8d4580d8056d5f94725efaacb757b6c724a8a50fda7d059c81af088f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x961C 10020 bytes