Malicious PDF — malware analysis report

Static analysis result for SHA-256 8600ee3a8bd95af0…

MALICIOUS

PDF

40.6 KB Created: 2020-08-28 01:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1dbd631bfe061ee12f076ccc02142ce SHA-1: b97d2b991d8715e8e5dee4384887f85b3fe92355 SHA-256: 8600ee3a8bd95af0728bfc5cadc03d0f18accf60b8c451aa393fb05a18a69a2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing, with the document serving as an attachment designed to lead the user to a malicious site.

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=encyclop%25C3%25A9die+philosophique+universel
    • http://files.ryanstandish.com/uploads/1/3/1/4/131482853/wipuvimede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/6179/5230/files/bigopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/befabisog.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/83995274514.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/reddit_mtg_arena_codes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1914/0252/files/99493127122.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/ximokimolus.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/gefusififofamade.pdf
    • https://cdn.shopify.com/s/files/1/0465/3409/9094/files/bexora.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/solidworks_tutorial_13.pdf
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/menowesexumaxugami.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005061.bin
24418a2d0b954f5e4be0b717a7cb81a324e97bbcff6e37bfe6042ca93fe226cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5061 5140 bytes
font_01_sfnt_off00006184.bin
d3f74e5e20a81c04d247d31b4edcd16c545f2ab5a462de2cef40925e5c93bbfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6184 11288 bytes
font_02_sfnt_off000085af.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85AF 4324 bytes