Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7f4721addd4e45…

MALICIOUS

PDF

56.9 KB Created: 2020-08-30 21:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2083d88176995b7259de8ec78832d7ba SHA-1: c35c7ed81c82e84755b1b6b9348a92f47a19c82f SHA-256: 6d7f4721addd4e456c3dc311f4bb25115f16c3253de64d5c18342d0a5784e061
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains references to the redirector URL and appears to be a lure for users searching for game mods. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known 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=minecraft+1.10.2+furniture+mod
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/30e015_e298cfb1f74f4c619d2b97086498cecb.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_71cfcb1eb9bc4313a28b71cd08a9a864.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_a641742b4cb1493bbc5aa3897e2adf94.pdf
    • https://static.usrfiles.com/ugd/10e3af_86b03b45e46a4d47b1f83bbf49851ed4.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a2b0324e5e4562ad4f5ea1b57b51ee.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/jitalavixitoweloruxuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/45767973461.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/defelogizidisupinejifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/36936719903.pdf
    • https://cdn.shopify.com/s/files/1/0440/5107/1126/files/vowofavazusokebokibog.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/bmc-_91_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/pirubijosasozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/information_technology_project_management_5th_edition.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008137.bin
792e288023e4fbe73a0351c4e4cf94c19217598e688914c0413f09f13c1160d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8137 6568 bytes
font_01_sfnt_off00009184.bin
2ffd42f281d9198f0f00cbd08fc3ddc700e37705c910a768cc08962df0495683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 5320 bytes
font_02_sfnt_off0000a38a.bin
003ab02c303e852db3a8e481ff72223f680efd8990f59815475b1354a47244f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA38A 3884 bytes
font_03_sfnt_off0000b2c2.bin
30b20350a13d8f2fc79fff6e550eb3148e9d0efcddb05544e5b85643185fd682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C2 10196 bytes

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