Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb0ff610b3859e3…

MALICIOUS

PDF

48.1 KB Created: 2020-09-01 12:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a66b0469a9d78578ac7dc61b2f51039 SHA-1: f105c7114ac2bafacf49661947e2ffbf8b15b6f2 SHA-256: afb0ff610b3859e318c2e7d75d35c38454ec0c05ed1b7ce78bef47d1732fbad8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a typing keyboard tool, aiming to lure users to a harmful site. The PDF also hosts a large number of external PDF links, many of which point to benign content on Shopify, suggesting a link farm tactic to improve SEO for the malicious redirector. No scripts were extracted, but the presence of a critical PDF redirector link and ML classification strongly indicate malicious intent.

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=english+to+bengali+typing+keyboard
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/98727234036.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/tisuter.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/english_grammar_rules_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/cerwin_vega_vpas10_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0449/8112/5278/files/the_adventures_of_tom_sawyer_play.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/baratza_grinder_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8768/4003/files/topix_orrick_mo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/bepekomagevelevunup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3420/files/spice_1_187_proof.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/gopuzifetikafisuvedadat.pdf
    • https://cdn.shopify.com/s/files/1/0436/1319/2349/files/35779784020.pdf
    • https://cdn.shopify.com/s/files/1/0440/6607/8870/files/nefevopitasux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/14900729688.pdf
    • https://cdn.shopify.com/s/files/1/0440/2633/1286/files/chest_guidelines_dvt_prophylaxis_orthopedic_surgery_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006667.bin
4b3af38fd6d82811589275167e5b670225eba7fbe367b2fe3110dc97211a8c64
pdf-font-stream PDF embedded font (sfnt) at offset 0x6667 5484 bytes
font_01_sfnt_off00007907.bin
9b33e4c4112dd09cc271b37b92376a34df997d51498880b4436b2b1dec8eb84e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7907 6476 bytes
font_02_sfnt_off00008e8f.bin
cd6f9620701054e2c19a62bb0b1684a56a9e2562aba152e7e7bd4672ceeab3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8F 10128 bytes