Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b80af9ef3df0577…

MALICIOUS

PDF

134.5 KB Created: 2020-09-18 20:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d56b26e46216c6812ff37023e3be6a50 SHA-1: b420698b3ac1d9bc6909d11e80f0ff15a837c0bc SHA-256: 0b80af9ef3df0577d9ce31111037aee7286f107b8cc3294e50d6f7773f08b2ac
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.link/wix?keyword=when+was+the+age+of+imperialism`. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with `https://cdn.shopify.com/s/files/1/0434/9997/8904/files/51516648573.pdf` being the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains the same suspicious URL, suggesting a social engineering attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.link/wix?keyword=when+was+the+age+of+imperialism
    • http://files.pacehighchoir.com/uploads/1/3/1/8/131871891/2056809.pdf
    • http://files.andybutfoy.com/uploads/1/3/1/4/131407459/1167986.pdf
    • http://nabiwule.uptownwadesboro.com/uploads/1/3/1/6/131607310/3525069.pdf
    • http://files.kahuiakokimotueka.com/uploads/1/3/1/6/131607075/bipanubuwejewi-vitovofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/51516648573.pdf
    • https://cdn.shopify.com/s/files/1/0430/5662/7866/files/56635798108.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/ielts_reading_academic_practice_test.pdf
    • https://7ee8ab93-3c0d-4c40-8037-370d7484e02c.filesusr.com/ugd/46bfb0_ba718245816444c29143eb0bc004753b.pdf?index=true
    • https://3e3c00ee-8de9-4c33-9e72-b259cb753d2e.filesusr.com/ugd/45fd81_ac1e6a9cd3664c40b13aa92ef0d42b8b.pdf?index=true
    • https://6edb9083-e0b3-4abb-800f-78587b5ea3b0.filesusr.com/ugd/1b0481_1104e00d89554472a92312e73c4e7dc1.pdf?index=true
    • https://1c8dd7f2-3206-49b0-92e6-d594db2b52da.filesusr.com/ugd/b7306e_77173b6a8d304336b910bf5949586cbe.pdf?index=true
    • https://c7b3caa5-5511-4334-82ba-bb953aa0059b.filesusr.com/ugd/136d3d_87b77f6b4d394363b6c169d83833b2da.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c738.bin
f925c242170ed4a7cbfa3ca6143b7c8f0ef988b336e070329b97089806fee54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C738 3616 bytes
font_01_sfnt_off0001d411.bin
e6a2924ca2f4ede82386b21b304461f5258f1677f79d022c3b3629b3bb845b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D411 5420 bytes
font_02_sfnt_off0001e671.bin
dcc3ca0fca663d50f13ac0ebaf56c3f94b9fe054107b6dcae18bb1b8726f5ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E671 11484 bytes

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