Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8816b59921c85b…

MALICIOUS

PDF

34.6 KB Created: 2020-08-10 23:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f645206ab54e78a1deab9fad9fadb09 SHA-1: 4019973980b2a8466700b4dffd0450f790874f58 SHA-256: aa8816b59921c85b5e92d51207eb25013d00f87bd5745e841c2741fb9b1095a1
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in SEO link farms to artificially boost search engine rankings or distribute malicious content. One critical heuristic identified a PDF redirector link pointing to 'ttraff.cc', which is known malicious infrastructure. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking Shopify URL, suggesting a lure to a malicious site. No scripts were extracted, but the primary attack pattern involves redirecting users through a chain of links, ultimately leading to a malicious destination.

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=ortopedia+pediatrica+staheli+pdf+descargar
    • http://files.bestmassageinpensacola.com/uploads/1/3/1/4/131406563/fedozuraxubil_rogekefafej_pubuwumunik_paduwapiwuji.pdf
    • http://files.barrvillemc.org/uploads/1/3/0/7/130776118/423244.pdf
    • http://files.btefit.com/uploads/1/3/1/8/131856353/04270f8f0e.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/10610418495.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/vasafizop.pdf
    • https://cdn.shopify.com/s/files/1/0441/0785/8072/files/luxekudefolireferigawek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/79356310860.pdf
    • https://cdn.shopify.com/s/files/1/0438/9001/6424/files/phonics_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/ctet_answer_key_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/zoresapedubaji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9911/7986/files/48350358638.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/kexanonipeje.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/49518898420.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/aptitude_test_questions_and_answers_for_software_companies.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8769/files/ut_austin_tuition_bill.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/lagesinilugakututi.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_off00004a35.bin
2d24d6646d01c4a3e9a22f2c1850a2d6b1661a732c151bbbd8db74f45f765a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A35 5444 bytes
font_01_sfnt_off00005cb7.bin
1f4554ef5e70933732a70b27a6442265e2e5125266e934edf204acfa942aed03
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 9592 bytes