Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e4019789fb10e5…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 20:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f980b10d651c7b4b1835eac2d5da95a8 SHA-1: f0457f1a1bef2c5c2b5fe733c9c3e8cb31d468e7 SHA-256: a6e4019789fb10e57f0cd0f47bc03f89115e5609c31c46523eec75907952e3a6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. Another critical heuristic, PDF_SEO_LINK_FARM, confirms the presence of a link farm. The document body, though heavily obfuscated, appears to be a lure related to 'Spanish grammar rules cheat sheet pdf'. The primary malicious activity observed is the redirection to malicious sites.

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=spanish+grammar+rules+cheat+sheet+pdf
    • http://files.rakscandi2.com/uploads/1/3/1/4/131407704/tobuzuwolevapoz.pdf
    • http://files.samanthapagnotta.com/uploads/1/3/0/7/130776674/1456232.pdf
    • http://files.angelicharpacademy.com/uploads/1/3/1/1/131164569/jobitedapisame.pdf
    • http://files.bluebonnetgang.com/uploads/1/3/1/4/131407493/jimitidako.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/kuwovuvumanojigax.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/3005498360.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/mulizukura.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/majakodijudijujujisixesil.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/86414280016.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/21280977518.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/sijoboxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/62097645744.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/59078514402.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/tegirorad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7295/4269/files/39058792302.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/27709821676.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/zinefenekisemepi.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/
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/majakod

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071a3.bin
6fb49362468cac5386e260f2411f6efff322c25a5ccbfde0d4aa1fcd27ab09b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A3 5444 bytes
font_01_sfnt_off000083ec.bin
efc862624d7b0a28f18db776ee845173995c0ea6cc09b345c7440d30a38fac55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EC 14340 bytes

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