Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad2d8545bcb0f4c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 17:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 410a30db9ad89f808a24d06f4eb6c36b SHA-1: 550e8eb17741e0dc1051a0e124d47f433a43b6d9 SHA-256: 6ad2d8545bcb0f4ce5f72b4f947839a7c3db1e4c92fd2d770283949fb6e6c72f
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results, with the primary malicious link pointing to a redirector. The document body text and embedded links suggest a lure to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=phpstorm+reformat+code+doesn%2527+t+work
    • http://bukesoj.timberkreekcarving.com/uploads/1/3/1/3/131380600/pijikixilire.pdf
    • http://files.aclwolfpack.com/uploads/1/3/0/7/130775813/4a59bd571a082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/vivojavakewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5181/files/nidajatamuduvetorefinejop.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/casio_ctk_2400_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8482/files/65603889642.pdf
    • https://cdn.shopify.com/s/files/1/0429/0753/3475/files/15503557702.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/bushnell_telescope_manual_78-_9512.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/agathias_histories.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/nubigoxamusigafebavotew.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/81912656982.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_off000062e3.bin
6443182448bbe21f27b17dd391bf981a0c34894ce71e4b543d01c892d10e1b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E3 5556 bytes
font_01_sfnt_off000075b7.bin
2dd3c3ad16dc556fcf94e8abea850be47b0643e67db4394234e269a1782865e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B7 10976 bytes

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