Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd2acddb5b5ea1e…

MALICIOUS

PDF

45.1 KB Created: 2020-08-11 17:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd03936e819ca5c011cd91ae6cac3d6e SHA-1: be997d9e4a17d165d6ab1fdf490c8c0fb2b44c52 SHA-256: 9fd2acddb5b5ea1ea2a146e9c72b81f3d7a3384ee9b99e8496ecb351d91b7f21
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a link farm. The primary malicious link, 'https://ttraff.cc/pify?keyword=dg+a+b+c+d+check+pdf', suggests a redirection to potentially harmful content. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains what appears to be a reconstructed URL, further supporting the malicious intent.

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=dg+a+b+c+d+check+pdf
    • http://files.splendidgh.org/uploads/1/3/0/7/130775357/fafojolamuv.pdf
    • http://zotixod.paulabeasty.com/uploads/1/3/2/6/132681579/subuxagediz-bixikubawudixo.pdf
    • http://files.theresearchmonster.com/uploads/1/3/1/3/131380107/67e08cd7fb83.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8860/9429/files/97892977476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vojinanekarab.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/51180280096.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/55649217819.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/10513483765.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/mitosis_cell_cycle_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/76356671282.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/algorithms_and_data_structures_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/30638718228.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/tiperonuduviku.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/l_amant_en_francais.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_off000063d8.bin
832fcc56951ba1ecd8fde11ebe87a149473bf8d98b6361f21076ff54982d97c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 4756 bytes
font_01_sfnt_off0000740c.bin
49d2a99e56888796b373cd2a0252603882178938fa5575255c251168880166e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740C 11532 bytes
font_02_sfnt_off000099bb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BB 4324 bytes

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