Malicious PDF — malware analysis report

Static analysis result for SHA-256 b939945bd489483e…

MALICIOUS

PDF

48.1 KB Created: 2020-08-08 23:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a89ddc709d3168f32007bad28672596c SHA-1: 71680edd831559e715bb679177e9ad5830d214a9 SHA-256: b939945bd489483ee0c986faa27b2e5f77402930a0ce697807ffb6a989c3f53c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The primary malicious link is https://ttraff.ru/pify?keyword=b%25C3%25BCrgschaft+friedrich+schiller+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other external PDF links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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.ru/pify?keyword=b%25C3%25BCrgschaft+friedrich+schiller+pdf
    • http://zavawu.dkgalphachapter.com/uploads/1/3/1/6/131636664/zawol.pdf
    • http://bonir.cypresspointportal.com/uploads/1/3/1/1/131164250/6432354c899.pdf
    • http://files.vexsens.com/uploads/1/3/0/7/130775846/waforumuwanaxogudo.pdf
    • http://files.theluxurycarguy.com/uploads/1/3/1/8/131857445/4521403.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/21280615769.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/bharat_ratna_award_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/53157899346.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/99359490729.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/ms_excel_2020_tutorial_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8870/5688/files/54376985210.pdf
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/8068725824.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5066/files/83074753022.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/52566372690.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/47454218699.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/kaxijogimamepadidipi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3570/files/60704922576.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eb5.bin
808cc0bdc1e29da33d88ba54fc21cdce7e2160c6e559286a3d5d2f815d9ff414
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB5 3152 bytes
font_01_sfnt_off000079e6.bin
2b44e2b052b576a91b01a23c77e8aa918110f2885ec5fe5fc2f711f63a839d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 5584 bytes
font_02_sfnt_off00008cb6.bin
3381887aeff4fabeb91f161eb3303ec31ed0eef9d5d67e68479af76334a68100
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 11080 bytes