Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c0d1d64cb41c59…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371b22ef75c87ac3bf7010c5eff5b0f2 SHA-1: c66ce888554b4e3ad97b00fd96c84f5a485d8542 SHA-256: 88c0d1d64cb41c5913f6c41ddfe55f304fe4e262f1e3c5a111cf3cf48f3771f7
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Business plan for a new restaurant pdf' and the malicious URL, suggesting a lure to trick users into clicking. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of redirecting users. 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=business+plan+for+a+new+restaurant+pdf
    • http://files.99waysesl.com/uploads/1/3/0/7/130776821/65a58.pdf
    • http://files.architecturalglass.org/uploads/1/3/1/8/131856068/bbc6fbfa33d2.pdf
    • http://files.supportersofoperasingers.org/uploads/1/3/1/6/131636689/najazanemege_gibamopagov_notopeponevon.pdf
    • https://cdn.shopify.com/s/files/1/0432/4330/7175/files/xuzudatijazirenemofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7269/2122/files/libro_adonay_jorge_adoum.pdf
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/38369050011.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/aditya_hrudayam_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9130/4343/files/939056309.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/adobe_acrobat_editor_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/8000/files/71332892122.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/90017482143.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/how_is_passer_rating_calculated.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/72404102606.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/renuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/womalifixotojurup.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_off00006cf6.bin
13a223e4ca4bbaa956fbe5873dc72b8942a0fe8e9a97bb5305d939bfb533f360
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF6 5176 bytes
font_01_sfnt_off00007eb7.bin
47d71da46f294fad4eb3b8206a62781dd074df77a6bba0b3e078ab6d2131deb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB7 10144 bytes