Malicious PDF — malware analysis report

Static analysis result for SHA-256 776a76a2f7399f49…

MALICIOUS

PDF

47.8 KB Created: 2020-08-06 04:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0731c5ce7cca00794d3f71b63c115014 SHA-1: a8f12d18a20f65cf34a03f6b9305ae2130a60fc7 SHA-256: 776a76a2f7399f492f2a5ed0dc4876d2207900fca9ef42fe76f1883e26f4d969
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=benefits+of+shared+reading+pdf`. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirect URL, suggesting an attempt to disguise malicious activity as legitimate content.

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/pify?keyword=benefits+of+shared+reading+pdf
    • http://files.colhenryart.net/uploads/1/3/2/7/132712129/gisogoxebowuvu.pdf
    • http://gujovese.greerunderwood.com/uploads/1/3/2/8/132815367/nigezenibetulofineg.pdf
    • http://files.breakoutrunning.com/uploads/1/3/1/4/131438216/seleto.pdf
    • http://files.staragricultureproducts.com/uploads/1/3/2/7/132740338/3741638.pdf
    • http://files.studentslibraryproject.com/uploads/1/3/0/7/130775346/xatobununujuxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6354/9847/files/lugiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/45470548213.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/zisumoziwenijonuzexakani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/jutuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/uae_new_arbitration_law.pdf
    • https://cdn.shopify.com/s/files/1/0436/8351/2473/files/98955209755.pdf
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/10576923599.pdf
    • https://cdn.shopify.com/s/files/1/0430/6812/9431/files/gujiwefagaveje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/mekanala.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/fluticasone_salmeterol_davis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/rinorojaduvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/3843235761.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/operations_management_krajewski.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/neopets_wheel_of_knowledge.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_off00007b5c.bin
47321f6277199d76ea98630d9a3ad977bd0012cd7bc8d925bad32905ac70c4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5C 5320 bytes
font_01_sfnt_off00008d78.bin
93ff57044dc54e8c56a2e9d5cd1121a14480e9fd3c0a770931bf730efd2ef185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D78 10672 bytes

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