Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d38e6cfd2d4211a…

MALICIOUS

PDF

60.4 KB Created: 2020-08-20 02:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0f767f1772679fdfb96a364c33f7a9c SHA-1: 0ab5a7149c54ee6c45eed018aded1ff61c4cf30f SHA-256: 6d38e6cfd2d4211aad85e14f3f1ed1716f3ec28b1e104763ed6bfec99ed17470
194 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 suspicious or known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. While no scripts were extracted, the sheer volume of links suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=bunty+babli+movie+song
    • http://files.thepaullindereducationalfoundation.org/uploads/1/3/0/9/130969981/nuwejununu.pdf
    • http://files.bensegarza.com/uploads/1/3/0/9/130969260/busukatetanaxijiden.pdf
    • http://rekezo.exact-timing.com/uploads/1/3/0/7/130739592/fabapevodanapibotit.pdf
    • http://files.sciencebrewer.org/uploads/1/3/1/4/131437149/wugesuzazeko_xaxasojitoveb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/5103/1464/files/gadumeramakugotudigavale.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/4u_cabinet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7991/files/vidmate_9apps_install_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/boxulexekizad.pdf
    • https://cdn.shopify.com/s/files/1/0433/1490/5256/files/zakisonagidizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/analytical_chemistry_by_g_d_christian_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/bng_gi_cp_cadivi_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/nccn_guidelines_esophageal_cancer_2018.pdf
    • https://cdn.shopify.com/s/files/1/0440/1253/5958/files/star_wars_x_wing_miniatures_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/27863835771.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/jesokufapiwedilegut.pdf
    • https://cdn.shopify.com/s/files/1/0441/4416/5016/files/55558055129.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096e0.bin
fbe735aeef985e8f41d42bec5c1e6dc5790222fe67201459a847bfec399fb34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E0 5260 bytes
font_01_sfnt_off0000a8c7.bin
49b5d096e7945ebdb1f9b85184a56645947b691928700c1b788a1645c11a957d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C7 14780 bytes
font_02_sfnt_off0000d624.bin
8c1e8a75a4a108d515e2f012b3046469e2eba468bf6e49dfa3e800572809ed95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 3800 bytes

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