Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d955ea8f7df49b5…

MALICIOUS

PDF

41.4 KB Created: 2020-08-19 06:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b6c5deb354e4d97bb95aa9d98805f3 SHA-1: 888b80e36f1b3e6d4b150cc1f2c2ad928523dd7b SHA-256: 7d955ea8f7df49b53222be76e3381b3f515bb395d8307f0acd985a382b1622d0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a critical redirector link pointing to ttraff.com, indicating a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a lure. The presence of numerous embedded URLs, many hosted on Shopify, further supports the link farm heuristic.

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=business+process+maturity+model+pdf
    • http://files.onceuponaprom.com/uploads/1/3/0/7/130738696/feburusugitosin-bilapurogage-fobetukim.pdf
    • http://files.mcclewarchitecture.com/uploads/1/3/2/7/132710753/2633009.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/bajojil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/76566781052.pdf
    • https://cdn.shopify.com/s/files/1/0432/0519/7985/files/moxizigomoxibotuxido.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/rixogudatiremudere.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/64551594988.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/12_note_kalimba_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/wakev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/55805071316.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/free_to_word_converter_download_chip._de.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/mazuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/93721411407.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/78801887061.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_off00006336.bin
ffd73f105cf35081969846e587da5eda623a53b8fe661824f25b13c72b5c1ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 5452 bytes
font_01_sfnt_off000075ab.bin
db59c24e94d09aff24e4f03763ed7adb9c46c5588c1df8927f23274e8b39fd31
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 10320 bytes