Malicious PDF — malware analysis report

Static analysis result for SHA-256 1064b64e2c384c6e…

MALICIOUS

PDF

54.9 KB Created: 2020-08-30 20:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc3d99626eeaaaaf92e432e47368ff76 SHA-1: 3fe7056107b0c1348a96400b605fe676027d3cff SHA-256: 1064b64e2c384c6e9166904cad8b0fc8be1107dc792b196e5303b77a120ea5e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. This suggests an attempt to lure users to malicious infrastructure.

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/wix?keyword=whirlwind+axe+quest+guide+classic
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9e41f0_2bdeb6ad052f4a5f850eca04b9ff5b97.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcfb9e3be3f649bc813496de8b74e824.pdf
    • https://static.usrfiles.com/ugd/c1615c_45089485fb4f4429a0c310ab8b7a1834.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d3269b0839740d79e79dbe27f89ce81.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/wadibez.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/football_skill_download_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0432/9144/3364/files/acidosis_lactica_congenita.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/37202190205.pdf
    • https://cdn.shopify.com/s/files/1/0463/1327/5554/files/function_notation_worksheet_precalculus.pdf
    • https://static.usrfiles.com/ugd/5b604d_5c842c6be0684c8ea19ea0da3c824508.pdf
    • https://static.usrfiles.com/ugd/20d83a_1553a2fc99a6454fbdac186c85876439.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7138/files/54930635868.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/kurexobiguwuleboxapalid.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/wind_crystal_swtor.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/sulokokukufawatowudokuzu.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_off000098b3.bin
c61f697569bb8b1fd7570569e4c03de9c6131524d3ec478b09420edcd0fc4f14
pdf-font-stream PDF embedded font (sfnt) at offset 0x98B3 5500 bytes
font_01_sfnt_off0000ab68.bin
3d83c7a41b3845e4fe5b709ce017831f3dd962837d9a8c83c22968ff08421fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB68 10184 bytes