Malicious PDF — malware analysis report

Static analysis result for SHA-256 86517ec38ad8199b…

MALICIOUS

PDF

44.9 KB Created: 2020-07-27 17:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20f8f15dbe440af376afae838b84004d SHA-1: aa1b5b6fdea5ad72cd4e66e721b0b0e381e87f58 SHA-256: 86517ec38ad8199b046b9b66239da067104124d83b810ad67a9604c4c19e8b08
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of the malicious redirector is a strong indicator of a phishing or redirection attack.

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=back+to+school+vector
    • http://files.fenestraglazing.co.uk/uploads/1/3/0/8/130814234/pomikijorufobufuwez.pdf
    • http://files.michaelrplewa.com/uploads/1/3/0/9/130969645/sazobidexegeju.pdf
    • http://files.centelmedia.us/uploads/1/3/1/8/131871979/febagiwev.pdf
    • http://files.suaxc.com/uploads/1/3/0/9/130969179/giwovuguj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/49840029955.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/gamopi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6111/6064/files/94853312828.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/jijek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/vemagavelaxiboju.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/34329624859.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/fiwofi.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_off00007783.bin
e5c68c406a159354631da22bb12c1fb67c5bb595ed4f65e4535a7d5523d98091
pdf-font-stream PDF embedded font (sfnt) at offset 0x7783 4696 bytes
font_01_sfnt_off00008782.bin
110154283eae286990deeff3b6c5f1035fc6c51242852980241b1c3466806937
pdf-font-stream PDF embedded font (sfnt) at offset 0x8782 9324 bytes