Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3cd6edaf7f7d17…

MALICIOUS

PDF

50.7 KB Created: 2020-10-24 22:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aa60b36eeafcd991d829076724e4c31 SHA-1: 5e26d26de51c49481289fd66eae370a2092a88f0 SHA-256: 4c3cd6edaf7f7d1725cbff264e17d849ab1735daf98ef939ec90be974e701843
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure suggesting it is a Wordpress installation guide, but it links to a known malicious redirector. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document prompts the user to install a browser extension or update, a common social-engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/123?keyword=wordpress+download+and+installation+guide
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/xawixaravoniv.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tipot.pdf
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/3895455.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0484/3841/1422/files/the_horn_of_jurgen_windcaller_failed.pdf
    • https://cdn.shopify.com/s/files/1/0498/0156/0226/files/47579940158.pdf
    • https://cdn.shopify.com/s/files/1/0496/1124/3672/files/78027341230.pdf
    • https://s3.amazonaws.com/zetare/fagaretupanoxuvus.pdf
    • https://s3.amazonaws.com/wonoti/jeston_nelis_business_process_management.pdf
    • https://s3.amazonaws.com/xanebavifamopez/calculus_a_complete_course_8th_edition_solutions_manual.pdf
    • https://s3.amazonaws.com/leguvefu/40167529565.pdf
    • https://s3.amazonaws.com/fomaralunex/28133633394.pdf
    • https://s3.amazonaws.com/kavitokolezub/savufowopixigumujaxixevir.pdf
    • https://s3.amazonaws.com/mukut/rumarolajujogomonezowifir.pdf
    • https://s3.amazonaws.com/kikunojulejuj/autocad_2016_3d_tutorial.pdf
    • https://s3.amazonaws.com/henghuili-files/89000933674.pdf
    • https://s3.amazonaws.com/mijedusovineti/mabupafofabovegajidibeg.pdf
    • https://s3.amazonaws.com/vapelurowar/solex_carburetor_diagram.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_off00007a4d.bin
b3acf7c2085c664aa06f9f2b33b2130ff9e5596e58128ac93ec9090ecb3e976d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4D 5112 bytes
font_01_sfnt_off00008bd7.bin
5b278fd607e33b33c5ebd401d4bb81ece37caaf109b96ef9fb84e2fa321b7e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD7 10400 bytes
font_02_sfnt_off0000af17.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 4324 bytes

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