Malicious PDF — malware analysis report

Static analysis result for SHA-256 26641fe39cb924d2…

MALICIOUS

PDF

42.5 KB Created: 2020-08-22 14:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c46e97b239f9b792ecda344c28d0064 SHA-1: b5eef335fae29593be3431d0c21c76533e56104f SHA-256: 26641fe39cb924d2ee44bab084a9cccd0891761ad39148c36655cb2c93955e02
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, https://ttraff.com/pify?keyword=probabili+formazioni+sportmediaset+4+giornata, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other embedded links.

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=probabili+formazioni+sportmediaset+4+giornata
    • http://simuk.christianservicearmy.org/uploads/1/3/1/3/131380600/nizovidek.pdf
    • http://files.loveittotransformit.com/uploads/1/3/0/8/130815228/kabar.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1910/files/cute_happy_birthday_photos_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/kanunuxopidojodugiduw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapiguwidekedod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/agricultural_science_textbook_grade_12_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/kitchen_vocabulary_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/play_store_free_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/bojedavomuxitafizoragu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9181/1734/files/anti_lock_braking_system_report_download.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_off00005c7b.bin
bd7d88e009b5ccc7396ec3e75933c15daa68774bb7b4c665c8e981b1732b1813
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7B 5640 bytes
font_01_sfnt_off00006f8e.bin
6ed682511df039a428c40444f3749157ad71efccacec143957f250a42c9bbaa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 15284 bytes