Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ae804dd6c82236…

MALICIOUS

PDF

40.8 KB Created: 2020-08-14 19:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aedf193d0b953366b091119a3b1a7030 SHA-1: 72e08cbcfc8e7c5c472de0b2dacd8cba3fdb7b12 SHA-256: a5ae804dd6c82236db89dc59bcb080b04e59312eb8c93c3c3a2f81568f03e7e9
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, many hosted on Shopify, suggesting a link farm for SEO manipulation. The primary redirector URL is `https://ttraff.cc/wb?keyword=british%20english%20grammar%20book%20pdf%20free%20download`, which is designed to lure users into downloading further malicious content under the guise of a free grammar book. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=british%20english%20grammar%20book%20pdf%20free%20download
    • http://files.thejansenandrahbekcollection.com/uploads/1/3/1/6/131637881/df4fe8d0.pdf
    • http://vepujen.ukirkolemiss.org/uploads/1/3/1/3/131384281/beluterut-xolopigow.pdf
    • http://molovit.tamukhornstudio.com/uploads/1/3/0/7/130775380/7405452.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/nufopebitonuk.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/dr_apj_abdul_kalam_biography_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9189/files/80927374251.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/bewuwamal.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4582/files/lejebatudusunudadan.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/buponomowekaxunid.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/aplikasi_blade_sword_of_elysion.pdf
    • https://cdn.shopify.com/s/files/1/0437/6100/8791/files/96443939907.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/at_dev_english_to_bengali_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0600/files/bailey_love_s_essential_clinical_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/pozisulujigosesug.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_off00006074.bin
b2af8d432743b5c18f4713c794cef35045728f542a42d33a3ae27fd4263c01ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 5800 bytes
font_01_sfnt_off00007414.bin
4f648fdc3734b8397e0ce1f922d6a2085070f39031925e067230081c08d4a308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7414 9996 bytes

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