Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37d68777f7b5be9…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 08:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c63e11b684763534ea4e80e0f7f19f32 SHA-1: 8f514f10e3d51e26bde212933ef20734541629b2 SHA-256: b37d68777f7b5be9261c5b7588e5cbbefb533bcdcf0c8213bafadcedca26f9a5
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=sri+aurobindo+letters+on+yoga+pdf. While no scripts were extracted, the sheer volume of links and the critical heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

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.cc/pify?keyword=sri+aurobindo+letters+on+yoga+pdf
    • http://files.cedarmilers.org/uploads/1/3/0/9/130969370/taxobuxafef-julile-damuliroged.pdf
    • http://files.aznstra.com/uploads/1/3/2/6/132695492/153817.pdf
    • http://files.lcisorchestra.com/uploads/1/3/2/6/132695325/a548167.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/bark_at_the_moon_solo_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/raxejugukudebitefirane.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/losesevev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/48287286002.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/kagivirubivoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/mufadaxokapopivik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1737/files/besujoxitepika.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/34497366886.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/nugatotolevarimunusaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/83717426057.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/68941146190.pdf
    • https://cdn.shopify.com/s/files/1/0436/4769/7049/files/ibps_clerk_syllabus_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1781/files/senamelavivuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/98161460632.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d0.bin
1c42ebdd8291a48e4e51ed1ab860091f1c14d219b4d35192653253ba0101972e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 5556 bytes
font_01_sfnt_off000076c1.bin
ea2c35a76e624b04b1577fcec678cab324e089d8ec1b299440fd1ba7beac8eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C1 9884 bytes

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