Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9300286bfe38ff…

MALICIOUS

PDF

38.0 KB Created: 2020-08-31 01:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db3dabb4762b951aa120db2c61892345 SHA-1: 3e7acd144b53e8032047590672f552c36ad8ff6e SHA-256: 0f9300286bfe38ff54a30fa90f6d25a9bab65353134f724cdbb709c725b3d176
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Botw acorn farming'. The presence of numerous links, many pointing to benign Shopify URLs but one to a known malicious redirector, suggests an attempt to lead the user to malicious content. 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.cc/wix?keyword=botw+acorn+farming
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/neuro_linguistic_programming_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/sharepoint_template_asset_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/taxurigidurokakeginuwuro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_b571e156ea074d73a1ad2152b50c975f.pdf
    • https://static.usrfiles.com/ugd/b9801a_68f47bc53a5e425bb464914c924940cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_73d35167e3314a91b553809de6946d12.pdf
    • https://static.usrfiles.com/ugd/a59130_ee9093324faa42628523206b14de7833.pdf
    • https://static.usrfiles.com/ugd/b8c837_cea0e7fddef34c329f71ace3b7fb39fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_3eb302010e414e41a3cf82b8467ae960.pdf
    • https://static.usrfiles.com/ugd/ca300b_33078854badc47c989916a98160b8eaf.pdf
    • https://static.usrfiles.com/ugd/b58d21_582e6c87005445749009260ea97f0169.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_off000056fd.bin
a6a52837a2af22472943ef28c9bf775f6be4aae9392d237c5b1425e4437894fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x56FD 5132 bytes
font_01_sfnt_off00006871.bin
8a3a4e3978cba2b89464b920f1a12e0c83bf287ed12e2e1fe9043c31044ee4e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6871 10348 bytes