Malicious PDF — malware analysis report

Static analysis result for SHA-256 38565ae4e39b2ac2…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 05:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4db12cd5f2bdb3a62a73b7ffb7adf3a7 SHA-1: c6ccc8a7cf9c30cfff7b468b0ec577ef6eb3831f SHA-256: 38565ae4e39b2ac24f59a106c8c0de53af56b26d0d894a43f039ce24bee66e79
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.ru/wix?keyword=immunotec+que+es', is flagged as a known malicious redirector. While most other links point to benign Shopify domains, the presence of the malicious redirector and the sheer volume of links suggest an attempt to manipulate search engine results or distribute malicious content through a link farm. No scripts were extracted, and the document body was heavily obfuscated.

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/wix?keyword=immunotec+que+es
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/komekuwodegamune.pdf
    • https://cdn.shopify.com/s/files/1/0434/7022/5574/files/national_security_agencies_act_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/45169242768.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/23305912777.pdf
    • https://cdn.shopify.com/s/files/1/0432/5916/6888/files/jilobufiteridevawuxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4928/6813/files/working_of_ammeter_and_voltmeter.pdf
    • https://static.usrfiles.com/ugd/95089d_802b62aa66f342d58c288919fa4dc7da.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_500eecbbf7364c3896389f3948de2325.pdf
    • https://static.usrfiles.com/ugd/b88e3d_f638659225194ac5b4ef6e1dfef9de16.pdf
    • https://static.usrfiles.com/ugd/1decf9_3c18d989ae994b31bebb0450930a2df0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3298a38d1344a948ab5f66ce293a1b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6e368138d1145d0b65419766879260b.pdf
    • https://static.usrfiles.com/ugd/0e2875_bd68912ff30c4e6986ffa0c348ff1655.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_bb88f65b48db4ffb8002846be081d51f.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_off00006cda.bin
1d8f3b88d310aa973af2d987a2cc12755306026d7417762b6a80bd5ec90f67a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 4672 bytes
font_01_sfnt_off00007caf.bin
040df543f4a4385cd367e99d8752b5f636d4c2f752dbc10342da4ff3c8eac01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAF 10192 bytes

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