Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc9d7d8f18f015c…

MALICIOUS

PDF

48.3 KB Created: 2020-08-23 09:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 870688d6aa4088364c257352d3dfbed6 SHA-1: f9ff278667c7e884aa6ed59332e6440efdd529a6 SHA-256: 7dc9d7d8f18f015cabc2c3ae939eecafeb11ef348e9690c05f5df42c1516926d
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=chromosome+mutation+worksheet+answer+key`. This URL is presented within the document body, disguised as a worksheet answer key. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a further stage of the attack.

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/pify?keyword=chromosome+mutation+worksheet+answer+key
    • http://sepek.puriri-wiltshire.co.nz/uploads/1/3/1/4/131437792/66b1dbfa92.pdf
    • http://files.haysvillehornets.com/uploads/1/3/1/4/131483097/f046c.pdf
    • http://tabomu.otterspacearts.com/uploads/1/3/1/4/131482950/8568591.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/besiwupixol.pdf
    • https://cdn.shopify.com/s/files/1/0438/4374/7990/files/14780169936.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2250/files/simple_cover_letter_sample_for_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/49490443668.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/53146900726.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/14747247649.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7414/files/doxejugarimikira.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/t_shirt_cutting_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/88657309489.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/nugokiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1900/0229/files/kakukisaxuzokizefowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/jixozok.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/57178413654.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_off0000711c.bin
7a30ee02dbda6df9eed28553ac4415949b050b6f59679df12dfdda3bfbe89112
pdf-font-stream PDF embedded font (sfnt) at offset 0x711C 5056 bytes
font_01_sfnt_off0000823c.bin
488a901de6359340dc3e071fc518171696f465eb40d855c9e11fb42ee867b269
pdf-font-stream PDF embedded font (sfnt) at offset 0x823C 10420 bytes
font_02_sfnt_off0000a5e0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E0 4324 bytes