Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ae037e2aa61d63…

MALICIOUS

PDF

35.3 KB Created: 2020-08-07 17:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbeac2c770ba97ce8a7f3c66fc13e28b SHA-1: 7193775416a5810ccb36503164d3ac1a3aaa0039 SHA-256: e5ae037e2aa61d6344641f6082fb865b830ccdd3948f4702249d0a120b544047
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/pify?keyword=chattanooga+choo+choo+piano+pdf. Another critical heuristic flagged the PDF as a link farm, pointing to many external URLs, including several hosted on Shopify. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting a lure to external malicious 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.ru/pify?keyword=chattanooga+choo+choo+piano+pdf
    • http://files.cinemaclubfilmprojects.com/uploads/1/3/0/9/130969459/5433442.pdf
    • http://files.baldwinhillselementaryschool.com/uploads/1/3/2/3/132303219/3531241.pdf
    • http://dosus.coldironarts.com/uploads/1/3/1/4/131437601/damesigefuda.pdf
    • http://files.barbarabairddesign.com/uploads/1/3/0/8/130874161/41becd71fde.pdf
    • http://files.sagemeadowranchllc.com/uploads/1/3/1/3/131383777/d0899cb76.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/fedex_airbill_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/99514364640.pdf
    • https://cdn.shopify.com/s/files/1/0432/3331/2925/files/bogebava.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/sepinoge.pdf
    • https://cdn.shopify.com/s/files/1/0435/4346/2037/files/george_bridgman_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/regojevobegulakumexu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/xikixotegedajebofipix.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/97524395397.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/turovapisulasek.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/didefagivuvosinugobuduv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/nezurutovunatavog.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/54456126190.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_off00004cc6.bin
e4b4487f9b11d14b0545f0d469916752b519d46e3bfe93d76378992c700305db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC6 5016 bytes
font_01_sfnt_off00005dd9.bin
8645541c12c2d4f538e61c759819692cecb3e4c32483b4d19bc38b9dce3dec92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD9 9996 bytes

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