Malicious PDF — malware analysis report

Static analysis result for SHA-256 220cd4eb626d3e3c…

MALICIOUS

PDF

42.9 KB Created: 2020-08-15 08:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3aeac0a2cca8fd8270aec9dfedd2703 SHA-1: 21d90057bac8b22b5694d393cf5bf272c1b65070 SHA-256: 220cd4eb626d3e3c2eac17c6905559ae9e3091f7b92870e37c74bd01bb185a6c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=timbangan%20analitik%20adalah%20pdf'. Additionally, it features a PDF link farm with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0431/2875/0234/files/barixobom.pdf', suggesting a lure to download further content. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL.

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/wb?keyword=timbangan%20analitik%20adalah%20pdf
    • http://femimalo.musicalcolts.com/uploads/1/3/2/6/132681947/9090076.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/barixobom.pdf
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/genero_lirico_actividades.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/8524007798.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/como_incluir_assinatura_digital_em.pdf
    • https://cdn.shopify.com/s/files/1/0436/7102/7865/files/d_d_5e_charmed.pdf
    • https://cdn.shopify.com/s/files/1/0432/8803/5486/files/benim_hocam_kpss_trke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9642/5119/files/jaxobom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/fanudununaluzuzuwig.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/gapapufixetadojimosuvusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/rogadepufugijofaluvib.pdf
    • https://cdn.shopify.com/s/files/1/0435/8560/1695/files/78109733684.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/rerusiwosubevitoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/pdf_reverse_page_order.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_off00005c1c.bin
35e1841c0296af54f75e93c4ae67635dec4778a8e85f1f2723bd98675549d081
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1C 4896 bytes
font_01_sfnt_off00006c85.bin
e736ec7df0cc2a6f526c11dfe492ccf0af27d4b472ec2c291a3fb864e6ae072e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C85 10696 bytes
font_02_sfnt_off0000908a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x908A 4324 bytes