Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e84143b5f84c509…

MALICIOUS

PDF

40.3 KB Created: 2020-08-04 16:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b6fc49dd2cd28ff0cf0a9a0052f9923 SHA-1: dcc55d312845b7a1ef8ddacfc46a35a7b30373a8 SHA-256: 2e84143b5f84c5091d70611e876e2fc684ca9c19cd074e413b64e0361680adb3
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, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the ultimate destination. The document body text, though garbled, contains keywords related to an 'SBI bank PO exam syllabus PDF', suggesting a lure to trick users into clicking the malicious links. No scripts were extracted from this sample.

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=syllabus+of+sbi+bank+po+exam+pdf
    • http://files.theboogerbandit.com/uploads/1/3/0/7/130738641/75de61d4c5f5012.pdf
    • http://files.taehohwang.com/uploads/1/3/1/4/131406269/pemor.pdf
    • http://files.materialcatolicoive.org/uploads/1/3/1/4/131454109/nuxifapekidaxawagiz.pdf
    • http://nekiza.wilddogpro.com/uploads/1/3/0/8/130874655/be1051c.pdf
    • http://dejebi.riverlureskayaking.com/uploads/1/3/2/6/132683328/400327f.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/gezirolufetikunidupuxuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/14715964795.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/fobemanudotozisefuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8881/2959/files/digezepexudax.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/24344576988.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9915/files/5473935663.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4277/files/dumigadezobuzivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3162/files/pulamibixof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/43783260370.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/mogofufesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5450/files/zepazusuno.pdf
    • https://cdn.shopify.com/s/files/1/0428/6359/1583/files/minecraft_forge_download_1._8._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/p90x_nutrition_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/16465260282.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_off00005ed2.bin
f22967c82f4c07ad00f4d88f5052a70b065339436e6cb27e74fdbabf56b4bf62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED2 5568 bytes
font_01_sfnt_off000071c4.bin
804a790905b55a102eefd16793e836b743875605705b4edc699e0e01dbd934c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 10088 bytes

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