Malicious PDF — malware analysis report

Static analysis result for SHA-256 f709e335fdcd5a92…

MALICIOUS

PDF

47.9 KB Created: 2020-07-31 22:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d18190aa021f921e6bd4de6ee9e5ee01 SHA-1: 6775cc50dbb47f8f77e056640b7143706957e868 SHA-256: f709e335fdcd5a9294e3983df72de2cc4e4289ca8539d608e2aa076bb46d98e6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL 'https://ttraff.cc/pify?keyword=necchi+sewing+machine+parts' is identified as a malicious redirector. The document body contains numerous links, many pointing to shopify.com, but also several to other domains, suggesting a broad distribution effort. The ML classifier strongly supports the malicious verdict.

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=necchi+sewing+machine+parts
    • http://files.whitemoosephoto.com/uploads/1/3/0/8/130814717/votorugixobujarika.pdf
    • http://files.bejoyceful.com/uploads/1/3/1/4/131483266/zujemewolijogeb.pdf
    • http://files.kerryhawkinsphotography.com/uploads/1/3/1/4/131437685/rasopus.pdf
    • http://files.nationalcapitalfencersclub.org/uploads/1/3/1/8/131871614/ab7ac88c2a932f.pdf
    • http://files.rafiahdance.com/uploads/1/3/1/1/131163712/jiviwakikolinex_fokeze_xuliporefa_kaxujiju.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/29931428602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/gowasuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/dipatisodunat.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/71456658973.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/kuxagose.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/93351590469.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/fibadelodegiwetitanorevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0492/7905/files/fadasat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70474217151.pdf
    • https://cdn.shopify.com/s/files/1/0432/4805/8536/files/62283729280.pdf
    • https://cdn.shopify.com/s/files/1/0432/6434/4219/files/liziguwod.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_off0000709b.bin
8ad073d50d327750debe06abad8a89bd3ae1be9e744abd73117debc3d0f0bf4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 5056 bytes
font_01_sfnt_off0000819f.bin
2ee92adbce9bbe3531c15c7daad16c5a19beafb4e18d9dbe19a66bafbb834421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 10140 bytes
font_02_sfnt_off0000a43c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA43C 4324 bytes

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