Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34e2f1b991a5931…

MALICIOUS

PDF

49.0 KB Created: 2020-08-11 16:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51db054947d74729b8b9fc3ab0e7ad7 SHA-1: afae974f59cbd775ec2ec22df05e648269a1434e SHA-256: c34e2f1b991a5931bd236588da30c6c340756f219f009e05e41a80fc37c4be86
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting a lure to trick users into downloading further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDF files, many hosted on Shopify, indicates a link farm designed for SEO poisoning or to host a large number of malicious documents.

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=attestation+de+prise+en+charge+du+garant+algerie+pdf
    • http://files.holyinnocentsff.org/uploads/1/3/1/3/131380008/zuvubadex.pdf
    • http://mofoj.customer1stelectrics.com/uploads/1/3/1/6/131606289/taredubemabapo.pdf
    • http://files.killarneytidytowns.com/uploads/1/3/1/3/131380175/lamufose_mikimun_gupinujove.pdf
    • http://jesoz.collectiblesforchrist.org/uploads/1/3/2/8/132815367/3062212.pdf
    • http://dovod.fbcapeville.org/uploads/1/3/2/7/132740405/fafufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/wuzojukegilugusilegus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/68605322376.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/rubexemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/96058493819.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/bauman_letter.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/xekumirezidaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/17121194403.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/libat.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/95744705442.pdf
    • https://cdn.shopify.com/s/files/1/0439/0138/6920/files/1507600642.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_off00007d44.bin
927bdfbdaf70c31abdafcc005b6ba08c2fdc9362106b94cec91da1a85ba6d4c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D44 5408 bytes
font_01_sfnt_off00008f9c.bin
f20eac46801200fdf337fc7940a13a421cdf2d87386379b5ff9ef0d6196723d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9C 11704 bytes