Malicious PDF — malware analysis report

Static analysis result for SHA-256 54df38d8081f9b82…

MALICIOUS

PDF

40.6 KB Created: 2020-08-04 15:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325f69c6ac28a8a434cf0f36d4c5044c SHA-1: 868ac84444bc8b10469cfe6b192fc3c55aa9ed42 SHA-256: 54df38d8081f9b82c8fcc264d2d492c0d5ec22f700efee094c347d2c5718e073
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to educational materials, likely a lure. The primary malicious indicator is the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which points to ttraff.ru. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=year+3+addition+and+subtraction+word+problems+pdf
    • http://files.the-crib.org/uploads/1/3/2/6/132695554/6677049.pdf
    • http://files.yecsonline.org/uploads/1/3/1/4/131453536/a6e1114.pdf
    • http://files.louisawarren.com/uploads/1/3/1/4/131438098/kutexapajuti-fodibajogilip.pdf
    • http://files.istagesydney.com.au/uploads/1/3/1/4/131438059/sowogeke_genuxovetivuze_datefovolipu_dijef.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/3937708209.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4452/files/vamanulesigowatekovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/s._s._c_sample_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/lageli.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9308/files/rolesafewazogobed.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/fideveluvorebedes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/putigorurexelapeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/merimaku.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/14939029600.pdf
    • https://cdn.shopify.com/s/files/1/0437/5619/1893/files/geometric_drawing_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/melalulomemojena.pdf
    • https://cdn.shopify.com/s/files/1/0435/2311/3119/files/mechanics_of_materials_beer_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4785/2959/files/fuguzisu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/ruvorisulik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/42987615854.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053de.bin
f5b276cdccbb5968f4c2762047d7800504d0731007e2d2784da7eb9837e9bf53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53DE 5540 bytes
font_01_sfnt_off000066a5.bin
dcd26009506e9826a3e28272e7348cb0d0fc15a0b0adfd3c83a1050c495c607f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A5 9408 bytes
font_02_sfnt_off000086d5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D5 4324 bytes

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