Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d8c2e7cfc6e5a7…

MALICIOUS

PDF

42.3 KB Created: 2020-08-20 00:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c502d1f5b7fc550939277c92476cfb8a SHA-1: f5edaf0cdeddd01eddff519f2b01abdee54ddd58 SHA-256: b9d8c2e7cfc6e5a7fde54c6273faa80b885b9fab05847dae205fac31af4d37b4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'maintenance engineering' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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.com/pify?keyword=maintenance+engineering+important+questions+with+answers
    • http://miwivaluz.wasiionline.com/uploads/1/3/1/6/131636948/xorilex.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/alelopatia_positiva_y_negativa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/17229646491.pdf
    • https://cdn.shopify.com/s/files/1/0436/1368/3874/files/organic_chemistry_functional_groups_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/56719841618.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/guliribewugomobuxazore.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/principle_and_application_of_chromatography.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/design_patterns_in_java_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/software_quality_assurance_tools.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/61525577396.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5517/files/44804413799.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/chiari_malformation_normal_mri.pdf
    • https://cdn.shopify.com/s/files/1/0436/7722/1017/files/87070985965.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054e7.bin
2d7286c8206444e40b1306ef9f4d504bc29a88eb8423b5ac327f2b29109b39ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E7 5540 bytes
font_01_sfnt_off00006798.bin
2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6798 2116 bytes
font_02_sfnt_off00007164.bin
c055266879c4de735e13787f6ca8d82fdd798660d901eb640a1c962384518109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7164 12772 bytes

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