Malicious PDF — malware analysis report

Static analysis result for SHA-256 899efa56159f45a2…

MALICIOUS

PDF

36.4 KB Created: 2020-08-19 09:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3375e23cdde382a5e1767ba0413db3b5 SHA-1: 1762d30fe426ede0cb31ab7a1f358eb05ac6ddc4 SHA-256: 899efa56159f45a2a5c02cf6925bb3c57a9422b28e162302016b26a5234a835c
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.com/pify?keyword=rcog+guideline+hyperemesis+gravidarum, which is likely used to host or redirect to a malicious payload. The document body, though heavily obfuscated, contains this URL and other benign-looking Shopify links, suggesting a lure to disguise the malicious intent. 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.com/pify?keyword=rcog+guideline+hyperemesis+gravidarum
    • http://files.mrhillsscience.com/uploads/1/3/1/0/131070009/witeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/drake_i_feel_blessed.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/2015_turbotax_premier.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/cabling_standards.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/cat_3208_spec.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1707/files/nimojoposubosupevozenud.pdf
    • https://cdn.shopify.com/s/files/1/0438/6465/3984/files/latest_ant_contrib_jar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/67262812536.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/65697880781.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_off000043e1.bin
10be1aefde51730f415cb167fffc78538fe01c30c6738aff5d5a39db64931a88
pdf-font-stream PDF embedded font (sfnt) at offset 0x43E1 5460 bytes
font_01_sfnt_off0000563d.bin
d702179795a27ce459e9c874daaa36ee35bbab47825029d4f290bdba473e6fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x563D 9588 bytes
font_02_sfnt_off0000770d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x770D 4324 bytes