Malicious PDF — malware analysis report

Static analysis result for SHA-256 0976f082ebd7ac0a…

MALICIOUS

PDF

41.1 KB Created: 2020-08-23 04:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a90b06355538ac4390eb6fa2e460ba73 SHA-1: 1390252156a94f2eda3d968c53a00ba56f1631b6 SHA-256: 0976f082ebd7ac0ac13bef22afc8178ce3e4cca921e816af98d1fd2017fad304
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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=wildlands+predator+guide
    • http://files.vitaldanzaireland.com/uploads/1/3/2/7/132711983/zidodu.pdf
    • http://files.hiswarehouse.net/uploads/1/3/1/3/131380583/wazokidodon_sizogo.pdf
    • http://files.psychiatristsofkansascity.com/uploads/1/3/1/6/131606155/posuvax-jebidof-tibogiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/darwin_theory.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/best_paid_screen_capture_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/lunonajubibajexeroremiwab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/16181306097.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/kofolimejedonevowibipiza.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/silulodaziginew.pdf
    • https://cdn.shopify.com/s/files/1/0448/0047/5293/files/advanced_accounting_multiple_choice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/5071/0693/files/83420149272.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/gizoxepedovujik.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_off000063b4.bin
736f492a51d7724ca8aa7b2d113aad3038a2b2c950308a7c69180567189c0721
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 5140 bytes
font_01_sfnt_off00007546.bin
5b4adb592967875a37fed45059cf138d47f0cdb65341bd8a4c4e26eacb9b95a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 10128 bytes