Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35c28adc04e4910…

MALICIOUS

PDF

46.9 KB Created: 2020-08-04 07:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 755b6716912829a94efb7bafddf76a31 SHA-1: 042813b4b74030fc3029c8bd7f42a0c0f903c78f SHA-256: a35c28adc04e491020d3703565c46ad5bebb621e0d46acb803f82b1aed4aeab7
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, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. This suggests the primary purpose is to lure users to malicious infrastructure, potentially for further exploitation or phishing. The presence of numerous Shopify-hosted PDF links indicates a possible SEO link farm strategy to improve search engine ranking for malicious content.

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=projet+d+aviculture+pdf
    • http://files.omsairaksha.com/uploads/1/3/1/6/131606262/2793166.pdf
    • http://matuje.tanyadann.co.nz/uploads/1/3/2/3/132303238/024072e95.pdf
    • http://files.cateringandcreations.net/uploads/1/3/0/8/130814513/9295549.pdf
    • http://files.flyinghorsearts.com/uploads/1/3/2/6/132681456/98c0e0caba43d.pdf
    • http://votazak.strokecarelongisland.com/uploads/1/3/2/6/132681352/7d5dc0b70708f.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/dugafujajokesumosijevadal.pdf
    • https://cdn.shopify.com/s/files/1/0438/9027/8568/files/fasusuxenufepatubejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/62350480971.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/47027946744.pdf
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/sinukig.pdf
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/aids_and_hiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/kesimalogipo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9829/0856/files/38605806024.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/komuvakagiverorudu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/defisupunadeze.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/66528757868.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/ordinal_utility_theory.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_off000075ea.bin
d12f492347ae475e95f8f6b0a0bc2090dc155b18d4ed03c8330b3adde5dd03dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EA 5108 bytes
font_01_sfnt_off00008769.bin
3e6d6d8eadf1348c4a681dc5da0e33228cc8bbb18ad2d62a0548fe4108a67baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8769 12324 bytes

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