Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfe5b14ac7b2881…

MALICIOUS

PDF

53.4 KB Created: 2020-08-17 07:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d1d9f0f212b0b021604df01248dbd5a7 SHA-1: 2b62f461788b581b7b8dcab974febe0386673230 SHA-256: 8cfe5b14ac7b28817d0cf6d6fb352ffe2a8189e74397292e3f55be900dd9ea51
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to redirect the user to harmful content. The document body itself is heavily obfuscated but contains the malicious URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=cinebench+r15+cb+ranking In PDF document text
    • http://jajatil.theevillageapothecary.com/uploads/1/3/1/3/131383483/fea05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/6246342352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/80997435086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4374/7990/files/16455464706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/national_anthem_song_mp4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/windows_7_activation_hack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/ralekotijagidix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3327/8102/files/vamanokidet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/rakijigudud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0581/1608/files/sitiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/general_allotment_act_of_1887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/mebalesewub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/venatezodatazizataxoroluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/aprendizaje_cooperativo_kagan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/0043/4586/files/treasures_grammar_practice_book_grade_6_teacher_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/41839452358.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CF 5136 bytes
SHA-256: fffb117d8a2223e428a9aae825d048ba3a5a9488f5a65fe592e974d2ee603e14
font_01_sfnt_off00008b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 12416 bytes
SHA-256: 7ef6cc21f1b20d7c4d6979a3a585481802c3d32beac8d14495e33a22d6bae746
font_02_sfnt_off0000b381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 16084 bytes
SHA-256: 40362fbc9d771ad4ffebf23d851d0e608cbe5e910bc9c9578be8a04431091e8d

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