Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa473a3ff6be9f83…

MALICIOUS

PDF

33.5 KB Created: 2020-08-24 09:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c368b856f24edf11ea9c32d70aa55828 SHA-1: 2a10fd502029394f2c41be4c51ed0d7f817f4313 SHA-256: aa473a3ff6be9f83ed0f761eba9ab72641b1b0d80530fe8d63236d725e56cf5d
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/pify?keyword=chapter+24+studying+the+sun+answers', is identified as a malicious redirector. The document's content, disguised as a study guide answer key, is a lure to encourage clicks on these links, which likely lead to further malicious content or exploits. 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/pify?keyword=chapter+24+studying+the+sun+answers
    • http://files.sunsetridgeatlanesend.ca/uploads/1/3/1/4/131453355/6121706.pdf
    • http://rasigifu.malti-pooscavalierkingcharlesspaniels.com/uploads/1/3/1/3/131380177/d3f244fddcf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9419/4843/files/47622627059.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/100_cotton_bed_sheet_set.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/gevarulekomakadugij.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/7556866117.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/datijenifune.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0675/files/24995937037.pdf
    • https://cdn.shopify.com/s/files/1/0432/0971/9965/files/93492985395.pdf
    • https://cdn.shopify.com/s/files/1/0434/8274/2950/files/jivet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/tigexetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3804/0487/files/wepuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3078/9800/files/a_b_m_ka_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1197/files/x12_999_companion_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3019/files/polotixofivasilub.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/cradlepoint_ibr1700_spec_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/apple_company_balance_sheet.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_off0000475f.bin
947010d1d444a1cd24b5e11fdeb08e6e56bcd6c61744b88b6e1cfe9e78efd0d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x475F 5508 bytes
font_01_sfnt_off00005a30.bin
ca6b42060f25731b34d3371b5a7a560ae7ffd73dc17f29900c44d6a867e6394c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A30 9052 bytes