Malicious PDF — malware analysis report

Static analysis result for SHA-256 390afefdf192983f…

MALICIOUS

PDF

33.1 KB Created: 2020-08-20 06:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86b614650492853676c91aa3ce5594ae SHA-1: ea00670bfc79e74012a6542a6a5ee284b079f259 SHA-256: 390afefdf192983f42ee1de2a1407ed68326f3bd1930d1ffbd520301d6d00b4a
120 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, which is a common technique for delivering malicious payloads. The document body and embedded links suggest a lure related to educational material, specifically a 'dna structure worksheet'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to attract search engine traffic and potentially mask malicious activity. The primary malicious IOC is the redirector URL.

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=dna+structure+worksheet+high+school
    • http://fibix.chloe-bee.com/uploads/1/3/1/4/131453645/dumigogakofu_jelod_febisitas.pdf
    • http://files.edmondmoms.org/uploads/1/3/2/7/132740756/7345960.pdf
    • http://files.painterly.shop/uploads/1/3/1/4/131452982/4dada2bdb9c7a8.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5701/files/rekosokeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/mesagagabepuxavoferulozis.pdf
    • https://cdn.shopify.com/s/files/1/0440/4038/8758/files/dokuvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/an_introduction_to_cardiovascular_physiology_levick_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3471/4017/files/6465633086.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/factores_bioticos_y_abioticos_de_un_ecosistema_acuatico.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/kotiginikoronuranoduted.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/bojomazewopebiluvawolipem.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_off00004496.bin
cb8b537190894a7377daba7321c0da6ff001feda6d27e0dd7a6851da29ded332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4496 5216 bytes
font_01_sfnt_off00005662.bin
11cca99e9a8f2f5bfce0887e1b72d50815e3749989f613ae1a087ceb8e4e6136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5662 9828 bytes

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