Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fb39ed1548ec01…

MALICIOUS

PDF

54.0 KB Created: 2020-08-08 17:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc4593b1f81a98fcc20031f7ac7843ee SHA-1: b67c80713e68cb78fe8e574914fb6fb955576f7b SHA-256: 00fb39ed1548ec01a973fdfd3592e57a3bdeb6bed0b20d033a1ccf3c956b8c10
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=aulas+de+violao+para+iniciantes+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to guitar lessons and the PDF's creation metadata, suggesting a lure. The presence of numerous other Shopify links, some benign and some unknown, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=aulas+de+violao+para+iniciantes+pdf
    • http://files.profilogroup.com/uploads/1/3/1/0/131070866/tavunugepiwati.pdf
    • http://zalero.biolutionresources.com/uploads/1/3/0/7/130776031/9535657.pdf
    • http://files.sarahfielkeblockofmonth.com/uploads/1/3/0/7/130739860/gumimilabafapiges.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/revuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/2002_honda_civic_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/63123497297.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/83918408745.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/d_d_3._5_downloads.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/jopoxotubuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/vagisizebowanuxabef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/femujusubo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a16.bin
32897c8f7b5ebbd78b8a89ab75f24475c62293e56ef9fd2643ace27b4b90a95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A16 5196 bytes
font_01_sfnt_off00008bdc.bin
97c5f6e50a1105be42dc5bc19a8cd2068a8204f5fb25ee8018d86bc1618b6e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDC 12944 bytes
font_02_sfnt_off0000b3d6.bin
36298d9b42482ef505b651e9545134b76438dad7e59d1f17d96a2cc3761d4b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D6 16304 bytes

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