Malicious PDF — malware analysis report

Static analysis result for SHA-256 da521b9a4ee12edb…

MALICIOUS

PDF

57.3 KB Created: 2020-08-07 13:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57fc9727eb117e8ccc3725677f6895e SHA-1: 4ec5b1605f449e43d09d77a54e4cedb3701d1290 SHA-256: da521b9a4ee12edb819b8379fc48da6e0b915aee2613c724752da6f86af7d50b
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector infrastructure. The primary malicious link identified is https://ttraff.cc/pify?keyword=diagramme+de+bode+second+ordre+pdf, which is designed to lure users into downloading further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=diagramme+de+bode+second+ordre+pdf
    • http://lovobejum.growingupcatholic.com/uploads/1/3/1/8/131871984/jojuxidiforipu.pdf
    • http://files.rigdzindharma.org/uploads/1/3/2/7/132740462/97480dacc0.pdf
    • http://files.stillnessinmotion.com/uploads/1/3/0/8/130813732/78cb58d52c3.pdf
    • http://files.vanessacollingridge.com/uploads/1/3/2/7/132740756/4553385.pdf
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/velaxevaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/kunonekurixowilinula.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/assistant_front_office_manager_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/26555468944.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/zifopopen.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/gnomon_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0428/8747/9455/files/25033025497.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/plural_nouns_ending_in_f_or_fe_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/fafetapenuj.pdf
    • https://cdn.shopify.com/s/files/1/0448/4608/8349/files/topological_sort_dfs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e23.bin
d67ba9c9ff36dbbacf09c9f2ddeeadbe4534d1f70c498daf164e7cbcd29eaf04
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E23 5584 bytes
font_01_sfnt_off00009108.bin
8e3dc18423ebcfd3e6c05023cfe043c3c384dd737ee0daff5b41d2260c07deb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9108 15648 bytes
font_02_sfnt_off0000c092.bin
c477cb86a3086cb63b7abbda2427d74b5648fcf23dc6304287161ad94834827f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 16240 bytes