Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63fd4f3c728529c…

MALICIOUS

PDF

46.2 KB Created: 2020-08-10 21:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88b244f3163d9756b9885d9c2a448c4d SHA-1: 0addc1f2974556645fa21a7f5b5f9311aa58cd90 SHA-256: f63fd4f3c728529c090903fa03600c4c9a7d6ba19565d89648b3b7779f60b121
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious content. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, further supporting the idea that the content is not user-facing but rather a vehicle for malicious links.

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.ru/pify?keyword=calculus+a+complete+course+9th+edition+adams+and+essex+pdf
    • http://files.myfinalsnotes.com/uploads/1/3/2/6/132681694/4ae1db9553585f.pdf
    • http://files.mbmusic.org/uploads/1/3/1/4/131438563/xelapal.pdf
    • http://files.thesquirrelloversclub.com/uploads/1/3/1/3/131379213/debitisenax.pdf
    • http://files.orchardsumc.com/uploads/1/3/0/7/130738836/4807517.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/regutuxudekusajixuwot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/75209689814.pdf
    • https://cdn.shopify.com/s/files/1/0454/5613/0200/files/canciones_infantiles_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/zalipurub.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/60968929978.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/ideology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/36612081055.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2063/files/affirmative_action_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0430/6957/1233/files/bolatovilirobakef.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/reader_rabbit_1st_grade.pdf
    • https://cdn.shopify.com/s/files/1/0438/3683/3954/files/creative_writing_a_beginner_s_manual_download.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_off00006b0c.bin
ff26ba003ffa8f5b484208a427a69aca474c35d8b5108f3a4904a6a178913781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0C 5524 bytes
font_01_sfnt_off00007dae.bin
bfc0038d6d4b6c996f2760cde8afa51b8ecc8d7951f75aba88a92f4a41824edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAE 14476 bytes

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