Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d8d6cbfe1db7ae…

MALICIOUS

PDF

39.9 KB Created: 2020-10-28 12:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30b7e337029013e229b2699cf658ce46 SHA-1: 804c79d54c01e780ff4a5b61071340fc36c7929a SHA-256: f5d8d6cbfe1db7ae258f9b52d85b3fdec22484cd30b61ad0676f782aea16e4fd
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded document body, though heavily corrupted, contains a URL that is also listed as a malicious redirector. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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.link/123?keyword=honors+chemistry+unit+1+worksheet+3
    • https://lusukukupesakub.weebly.com/uploads/1/3/0/8/130815137/dejik_pixerigo_wuvotaje_xukujo.pdf
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/merukuge.pdf
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/jarizirapa-kiriximimegeb-wokorajunad-desisikoxu.pdf
    • https://mibonapa.weebly.com/uploads/1/3/4/3/134308174/ravitepi_viwulukofini_xadelizufidi_xaxewibumuxij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wilugugo/24863598131.pdf
    • https://s3.amazonaws.com/tadovu/1488734806.pdf
    • https://s3.amazonaws.com/jamokaroxoj/zojejanawe.pdf
    • https://s3.amazonaws.com/fasanag/99095692861.pdf
    • https://s3.amazonaws.com/subud/clinical_anatomy_by_systems_snell_download.pdf
    • https://s3.amazonaws.com/sugaguxagu/dojawaxemitofolubasobada.pdf
    • https://s3.amazonaws.com/gifiz/gce_o_level_biology_notes.pdf
    • https://s3.amazonaws.com/pazifetanegapu/sadevasolasavuwipun.pdf
    • https://s3.amazonaws.com/pizexopenaxu/possessive_pronouns_lesson_plan.pdf
    • https://s3.amazonaws.com/xojafemori/90294541877.pdf
    • https://s3.amazonaws.com/rebomedug/aashto_m288-_06.pdf
    • https://s3.amazonaws.com/zidosozawok/dedoxipup.pdf
    • https://s3.amazonaws.com/pazifetanegapu/analytical_chemistry_notes_for_bsc.pdf
    • https://s3.amazonaws.com/zuxadol/asfixia_libro_alex_mirez.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_off00005dd5.bin
03bcc3c339cd3addc018ebb80e2f0be83245422f52ed2fbe949b9f56561084c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD5 5232 bytes
font_01_sfnt_off00006f9a.bin
95a678f48ec6b496eacd3c99500e9b76f62141b8ec89a43ea14d5ec5a55190e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9A 10240 bytes

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