Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3b4185e3e5485c…

MALICIOUS

PDF

47.9 KB Created: 2020-08-10 11:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a654edbe9cae2d143049efc53aab426f SHA-1: fc63e74506b141231df9f18749d33009893d4028 SHA-256: 6b3b4185e3e5485cae18acf412c4ad976a32dba5aef1e60f262a8fb1b8ba66b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body also contains the same malicious URL, suggesting an attempt to lure users into downloading potentially harmful content under the guise of a free PDF. The ML classifier also strongly indicated maliciousness.

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=surah+yasin+pdf+file+free+download
    • http://files.janhumphriesphoto.com/uploads/1/3/0/9/130969529/bapux-lujapeve.pdf
    • http://files.cbksteel.com/uploads/1/3/2/7/132741136/9800407.pdf
    • http://files.frministries4u.com/uploads/1/3/1/3/131398164/2040589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/38549968019.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/ditugufukakukexezixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/92073697097.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/gefanepegov.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/barangay_clearance_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/vuvefuzugivor.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/xapeworom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/christmas_bingo_printable.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/zumifalikewemefidebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2631/6455/files/xomuvidunedaziwasokir.pdf
    • https://cdn.shopify.com/s/files/1/0447/1206/7228/files/gaxog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/91505600955.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/nidubifetija.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/momo_michael_ende.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005923.bin
f7a613fda5ba50e51826cd50f69fcbe6c52e8b39af481034a561189469b0d3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5923 3144 bytes
font_01_sfnt_off0000645f.bin
6db6304437e5a022c1ea13ffa09a2b0dc4737592c6464fa4495c0327a64bbe78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 5428 bytes
font_02_sfnt_off000076e1.bin
09a4e82e64be91782ce660fbd2ce64bc4a63da177cad2d4f04979e258f0d0e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E1 10412 bytes
font_03_sfnt_off00009a2c.bin
e36a86003cc587a64c9d431d3db6c5f72a21b2b30b9eba25e02ac0e6d473d527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2C 16852 bytes

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