Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0898e68f278ed07…

MALICIOUS

PDF

33.2 KB Created: 2020-08-30 06:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccbf4624f646e66f91687fc69234bf4f SHA-1: 0e55904c9078e5648679967ef1cfe08133379fad SHA-256: f0898e68f278ed07fbd3cf7f854f17b963e84225fa8194b3c57ed75dfcc746c1
152 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=pdf+robotica+basica'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same malicious URL and several other URLs that appear to be part of a link farm. No scripts were extracted from this sample.

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=pdf+robotica+basica
    • https://static.usrfiles.com/ugd/b8c837_844f99191be048459ebf93f46e03fc78.pdf
    • https://static.usrfiles.com/ugd/409ca8_a932d1f541dc4bd0940a855c38dc4e64.pdf
    • https://static.usrfiles.com/ugd/b444d4_200b828650cb41e5ab0f61d6b9d604b2.pdf
    • https://static.usrfiles.com/ugd/99965f_f298a653fb92496696f2c1abf84d0f32.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/panodelib.pdf
    • https://cdn.shopify.com/s/files/1/0459/2520/4117/files/five_finger_death_punch_-_i_apologize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42257023754.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2935/files/porenoxogesag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/rerunupadij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/asme_code.pdf
    • https://static.usrfiles.com/ugd/3bca44_1bba959913d64a69ae98d8ba51263d3b.pdf
    • https://static.usrfiles.com/ugd/dc98cc_19233912f1724a248406d93d44d4c5b4.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b9bed7a6a16341dea7506f905dadbc8a.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_off0000464f.bin
50ba5c9cca8c71b53d3cedbfaf924f2af0c316748b21dc8280f1e060e4274374
pdf-font-stream PDF embedded font (sfnt) at offset 0x464F 5124 bytes
font_01_sfnt_off000057be.bin
dad13ecf7aaa50af6c5f2086bdb35f9e139732cbb0844a77060d2eec6b153c37
pdf-font-stream PDF embedded font (sfnt) at offset 0x57BE 9656 bytes