Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc4e5bb2d563101…

MALICIOUS

PDF

43.6 KB Created: 2020-08-03 00:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22fd4d3b3af53f3eaeb5ca314292677d SHA-1: d62676bcb24f9cf7a196dd3d0ecf12dee994307c SHA-256: ffc4e5bb2d5631017d8a9c312b10054a70f20c4560eefb44199250e3e50dd8f8
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The presence of the URL 'https://ttraff.cc/wb?keyword=cassava%20cyanide%20pdf' is a high-priority indicator of malicious intent, likely leading to a phishing or malware distribution site.

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/wb?keyword=cassava%20cyanide%20pdf
    • http://files.grimousironblood.com/uploads/1/3/2/8/132815298/1499270.pdf
    • http://files.kdvp.org/uploads/1/3/0/7/130740260/dinogelib.pdf
    • http://files.taffycorbettdesign.com/uploads/1/3/2/8/132815960/1d2acd6.pdf
    • http://files.quietlegend.com/uploads/1/3/2/6/132695633/40a14b0ff7da3.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/mawolafigufowumepovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/walmart_10-_k.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/45281954589.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/28694625676.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/viwexixizig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8160/5018/files/hayward_pool_pumps_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/wizofevutazuxuxeraxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fejekav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4687/files/65433223991.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/83319897883.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/kenezinimejibun.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/93253699823.pdf
    • https://cdn.shopify.com/s/files/1/0431/5227/7670/files/43394629733.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_off00006d5d.bin
fd48f7c4ad54c3c70aacf64dfccfbb1827089ba818269de4e3262aeb4a1612f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5D 5088 bytes
font_01_sfnt_off00007ed0.bin
f66782f33ce21f4cc5fe34d8085fc9fda4ded5b1621fed307dc7c50c46f2815e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED0 10208 bytes

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