Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc1834d58adbe93…

MALICIOUS

PDF

38.2 KB Created: 2020-08-28 05:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58b38271f4800dccf608781e76ae8a48 SHA-1: 132c28c5d073084a116a6aff4579cda23a50e121 SHA-256: 4bc1834d58adbe932ad4eabb17ad4b97888557155461631a1dc8c91a05e9ff23
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 a redirector service. The primary malicious URL, https://ttraff.ru/pify?keyword=school+dance+free+download, is designed to lure users with a fake download offer. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on various domains, suggesting a link farm used for SEO poisoning or traffic redirection.

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/pify?keyword=school+dance+free+download
    • http://jufifoda.pwdchicagoclub.org/uploads/1/3/1/4/131453133/a66bc2.pdf
    • http://gupax.zoehounta.com/uploads/1/3/2/7/132741100/c07b8848ba.pdf
    • http://files.wineandfoodsocietyofhobart.com/uploads/1/3/2/7/132740637/0eedf937.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/adobe_acrobat_windows_10_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3615/4773/files/razetedipuwib.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/gerubogamipetewot.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/22641579853.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/engagement_letter.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/sanizito.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/freaks_geeks_and_asperger_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/how_to_reduce_file_size_in_illustrator_cs5.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/fofibuwetitutosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1275/1523/files/81144712234.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/barupabobupuwubarawusarug.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3478/files/carnivalee_freakshow_normal_font.pdf
    • https://cdn.shopify.com/s/files/1/0454/8273/7816/files/medical_mycology_case_reports_open_access.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_off00005607.bin
ecbe3cf2b1a22163312452743d16fac2cc5a851138ec396dba7bfb6c95f009c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5607 5128 bytes
font_01_sfnt_off00006779.bin
a59e08c7eee804c2bfaef2f893086f79f9a0cbbf4de7df27123c13783373b40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 10772 bytes

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