Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11a1b911849c377…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 04:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9844d78ff190e5d8e7c2a848a344820f SHA-1: 78b58d4241972fb2ae56eeb7520ee14f33addbca SHA-256: a11a1b911849c3778389f09c800e39a7a20fa2f9ac240613147617a6a779aa47
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=sunbeam+bread+machine+recipe+book'. This URL is presented within the document body, disguised as a recipe book, indicating a social engineering lure to trick users into clicking the link. The presence of numerous other PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to mask the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=sunbeam+bread+machine+recipe+book
    • https://cdn.shopify.com/s/files/1/0434/0213/3653/files/cidos_e_bases_nomenclatura.pdf
    • https://cdn.shopify.com/s/files/1/0440/8259/3957/files/plan_bateau_bois_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/63361014936.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/barogekuduxutix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/letter_f_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/30888191743.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/accouchement_prmatur_cours.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/1169250602.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/bimakemosolufagonafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/bokunozezemajozuk.pdf
    • https://static.usrfiles.com/ugd/b0b521_7a4d76926c894b6a95899cec49bdc98a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d424ac2844b1474390a801dd8b290f2a.pdf
    • https://static.usrfiles.com/ugd/71fd01_c7e0c0969a2c437e9852390ba2720276.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_0ac3b6c6c5224bf0a2b623bef49b2dce.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_off00005e3b.bin
a1c07e921c955f075edbe9cc017a8099e6b635e0f5993eb8ea4ad7dde0bbdfd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3B 5408 bytes
font_01_sfnt_off00007064.bin
b752bb1a1d4ff8a2c8e5d06b1b3c4794eb8ba448141ebcfbb2db315ade150a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7064 10992 bytes

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