Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cd21357c00c65d…

MALICIOUS

PDF

36.4 KB Created: 2020-08-11 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 826829387f2342a1809e1485ffb6f0b2 SHA-1: db66afd805c51a9948dd4bb094be46c396b41c8c SHA-256: b4cd21357c00c65d4d59fc69709b39bffaf9c2d569ea23d0cde47b04454f882c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent link, 'https://ttraff.com/wb?keyword=linkin%20park%20what%20i've%20done%20piano%20sheet%20music%20pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating the primary intent is to redirect the user to malicious infrastructure. The presence of numerous benign-looking Shopify links alongside the malicious one is a common tactic to obscure the malicious intent.

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.com/wb?keyword=linkin%20park%20what%20i
    • http://files.roselawvermont.com/uploads/1/3/2/7/132710630/fugudekiwen_mosibab_fowasakeribido_rixafaboto.pdf
    • http://files.bartendingbydennisinc.com/uploads/1/3/2/6/132695361/josit.pdf
    • http://files.focused-fitness.com/uploads/1/3/1/3/131398140/5c3e1275b4f.pdf
    • http://dutuv.dryvettefit.com/uploads/1/3/1/6/131636948/1784653.pdf
    • http://kebowuves.returningtocompassion.com/uploads/1/3/2/6/132680813/safanonuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8651/files/authorization_letter_for_gst_registration.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/amphioxus_journal.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/63220338722.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/narenukefo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/29078439598.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/cat_330_specification.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7057/files/kunilugewudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/samyutta_nikaya_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/pududidewarivibega.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5656/files/budez.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2442/files/blackroll_mini_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4229/files/surikimudojepomux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42262915950.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9406/files/revolenet.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_off0000505f.bin
fdf4535aaf1894889eeb270ff3dd18d98439df1fee5723379585989d1506ef74
pdf-font-stream PDF embedded font (sfnt) at offset 0x505F 5552 bytes
font_01_sfnt_off0000632d.bin
48eb951cd6dcbeff1283994b191791222473001b6957a615d9c912ac5a2b0ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 9708 bytes