Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d254d4aab721c8…

MALICIOUS

PDF

50.1 KB Created: 2020-08-09 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f957dd7785da218a7d079fa3cad898ef SHA-1: 25de8204692f33904195eb315e4d8d6fcc7de1ea SHA-256: 77d254d4aab721c8ea5bd5a55385f16621f5288041196bcc3d0887d87b6a2e10
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to software downloads, specifically a PDF to Word converter. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or malware download.

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=pdf+to+word+converter+offline+free+download+for+windows+8
    • http://retukule.abstractdreamdesigns.com/uploads/1/3/0/9/130969723/sevizofumedogokoza.pdf
    • http://files.visualsofjessicasolis.com/uploads/1/3/1/4/131437573/6a8e52b5417.pdf
    • http://files.yaldocargo.com/uploads/1/3/1/8/131856160/losizukes.pdf
    • http://files.jollygeographer.com/uploads/1/3/0/8/130874046/jovotelolov.pdf
    • https://cdn.shopify.com/s/files/1/0448/4648/1570/files/sociological_and_anthropological_foundation_of_education.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/fogefagunofobibu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/dulifeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/79891854473.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/kalogatusiwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9833/files/21426772247.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/fidejodalepumaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/57540534576.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/mepikuje.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/runescape_cooking_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/bodybuilding_training_manual.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_off00007894.bin
ed58e8cd9869575d0da4211a99349c41042d1fec60eec514c6d7a8d818b9cd90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7894 5152 bytes
font_01_sfnt_off00008a2b.bin
71aa913f00626dd733056fbe46834a2713eb31f3c4d06684805d4fd2ca94f9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2B 9940 bytes
font_02_sfnt_off0000ac30.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC30 4324 bytes

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