Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a68b5085703b1e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-15 06:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42d8dc772d6050e089d62d27aa4b6580 SHA-1: 91903dcf08afa0fdc99023f511d392c53c65662e SHA-256: 55a68b5085703b1eafea836d9aa6416ab04367446e221aad0d6fcb8f117116df
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to Shopify domains, likely as a SEO farm to obscure the primary malicious redirector. The primary malicious link, https://ttraff.com/wb?keyword=comprehension%20worksheets%20for%20first%20class, is identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise 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=comprehension%20worksheets%20for%20first%20class
    • http://files.wilmingtonlatindance.com/uploads/1/3/0/7/130739674/7462841.pdf
    • https://cdn.shopify.com/s/files/1/0438/4600/8982/files/java_arraylist_initialize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1369814796.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/92395982508.pdf
    • https://cdn.shopify.com/s/files/1/0448/0483/3441/files/hollander_interchange_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/76054443283.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/tilogoxoranodosiwupuniru.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/255_affidavit_form_new_york.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18187133080.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/97429941798.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/rarevolasimobirusuviji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9309/files/vovojujowopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/40331832548.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_off00005d11.bin
1569adb1e316ce90da5e51f8f7c35f9a949f3dc9c9132a3a923801734f7f009a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D11 5316 bytes
font_01_sfnt_off00006f0c.bin
1f9e9b705d224d597e7b7e4c1863a20421ca96fa1677d9e0e808bc37a932bc84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 10248 bytes

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