Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a82cc7aa1933ca…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 07:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e871f8376f590be276ccc3e2feb5a503 SHA-1: 2f8661e2cb06478754358d21d002674c6427d09f SHA-256: b0a82cc7aa1933cabb67fa0ff6f0ae17350d5319ff725907e3a0db851ce66713
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=lagu+ost+the+huntsman+winter%2527+s+war'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which lead to benign Shopify domains. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL and a reference to 'Lagu ost the huntsman winter's war', suggesting a lure 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/wix?keyword=lagu+ost+the+huntsman+winter%2527+s+war
    • https://cdn.shopify.com/s/files/1/0439/3598/9928/files/biwovuwobojimojamune.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/39317422863.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/tufofeko.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/63002527373.pdf
    • https://static.usrfiles.com/ugd/b8c837_1063543c2d9b460a9568a7c07e9d1dca.pdf
    • https://static.usrfiles.com/ugd/b8c837_e340b4e0341b4c08a2f918c0e687e228.pdf
    • https://static.usrfiles.com/ugd/b8c837_404adcd3ec914b3bad63c6b2875a2582.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d9adcf7f3cb4488831910998b3b39ba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/xowozasijat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/zuxelide.pdf
    • https://static.usrfiles.com/ugd/b8c837_06ddd9b3d677487dbfac364752f69e4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e55e4022a0413fa662276bc3f6391d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae1.bin
11b7a2fb272ef5a3769c49e2c4a98de0249166b2e6d3829fd7f6ab1605b06fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE1 5136 bytes
font_01_sfnt_off00005c48.bin
5bfae7980454a91c9c93abe72b9d60657d8e085aaa85af0f8108a6942e4edb5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C48 10336 bytes