Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddc31db18e34e1a…

MALICIOUS

PDF

36.5 KB Created: 2020-08-09 03:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66fd0190127cbee8ecd38266c9fbb1f7 SHA-1: c30ff43596a1729af880cc5e6f61d0df4ac5b2ce SHA-256: 5ddc31db18e34e1aa0a810af12e38baa1ed3de6f77b18f56b05ab8e67d0aa81c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a 'relay manual' lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or traffic. 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/wb?keyword=7sj600%20relay%20manual
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdf
    • http://kefewojik.kennypughmusic.com/uploads/1/3/0/7/130776760/butimilekuzoxe-mosamozaf-jinuxurati-zobonev.pdf
    • http://jiboxul.tarafergusonphd.com/uploads/1/3/0/8/130813612/1912900.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4478/9653/files/3045831514.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/honeywell_ademco_6148_keypad_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/modern_abc_chemistry_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/fetitegubovaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/81258189023.pdf
    • https://cdn.shopify.com/s/files/1/0434/7514/0761/files/elementary_probability_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/17749604492.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/pure_mathematics_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/77058187664.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2342/files/range_rover_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/8263109845.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/33987396275.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005228.bin
0e282f9edf2b299087079e3d052fdb22249afe48218c16b47a3505155b9beab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5228 5288 bytes
font_01_sfnt_off0000641a.bin
d7da68ca486a78b03f4035aa3c956caf765b553de5904c186da08945fa6dca4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x641A 9868 bytes