Malicious PDF — malware analysis report

Static analysis result for SHA-256 d376fdc64383f1b1…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 17:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee0ee32f77dca5dde15998b6c4e03b68 SHA-1: 6be5177c58fa90db4ce942cc9ed301e903cb28dc SHA-256: d376fdc64383f1b1e18fec7e052d248338021c31642dee378a26f14a12171fdb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains text related to an 'Excel spreadsheet grayed out' and the malicious URL, suggesting a social engineering pretext. The PDF also hosts a large number of external links, many pointing to Shopify domains, likely for SEO manipulation to improve the ranking of the malicious redirector. No scripts were extracted from this sample.

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=excel+spreadsheet+grayed+out
    • http://dinum.globalpetport.com/uploads/1/3/0/8/130814328/fujatavi.pdf
    • http://tekula.poetatrainingcenter.com/uploads/1/3/0/7/130776158/tusiwirezuwitam-kugasiduxiviti.pdf
    • http://files.quiltbymachine.com/uploads/1/3/2/6/132681501/zuwedilogife.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/arboles_de_puerto_rico.pdf
    • https://cdn.shopify.com/s/files/1/0435/0279/6964/files/ceragon_ip_10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/famibarumabafonibebibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xagene.pdf
    • https://cdn.shopify.com/s/files/1/0438/9080/2856/files/58441707887.pdf
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/53014548783.pdf
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/35622912454.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/33048032455.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/dipasojejijudesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/71228512008.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/png_stickers_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/4920/6439/files/jewejobinin.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_off0000609a.bin
90f64932067dc5faf07f922fc526d162f3d39bc22b25b5ead08040fdadfb5008
pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 5460 bytes
font_01_sfnt_off0000732e.bin
694648b558be8dd397593aa3c8b28198ca66320d8775b65e4bc4cdd036a43b06
pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 13892 bytes