Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df97cf2dead906…

MALICIOUS

PDF

42.8 KB Created: 2020-08-12 06:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b665277b7e7ec4c3ee7ff269519695bf SHA-1: db59c360244a9950016244085bbe11c8bc27d1e9 SHA-256: 85df97cf2dead906700f080482e66ceabcaf2503d0be2ac9c0569b828613577c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a prominent link to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though corrupted, includes the target URL and references to 'dermatitis symptoms' and 'merck manual', suggesting a lure to a health-related topic. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict.

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=dermatitis%20symptoms%20merck%20manual
    • http://files.pemachenacu.com/uploads/1/3/0/8/130814588/gazafi.pdf
    • http://files.chroniclesofdestiny.com/uploads/1/3/0/8/130813643/0c69dc128b9c63e.pdf
    • http://bodoxota.eastcoastgermanspitz.com/uploads/1/3/2/8/132814930/wijif_bamegakabev_wotin_doxibosizesugu.pdf
    • http://redozuze.drneilvanza.com/uploads/1/3/1/3/131380429/9114184.pdf
    • http://files.artfullyfrosted.com/uploads/1/3/1/8/131871614/3c64de62661ea.pdf
    • https://cdn.shopify.com/s/files/1/0438/8818/1400/files/vifavemimogadepebuvumowaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/viburawagogebikunariv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/lorakedezupevixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0433/9050/1020/files/biotecnologia_industrial_volume_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/18252207403.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/jobotazajilotunad.pdf
    • https://cdn.shopify.com/s/files/1/0433/7781/9802/files/85160464810.pdf
    • https://cdn.shopify.com/s/files/1/0435/5073/6533/files/obi_wan_midichlorian_count.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/wakizazujivikanulejorig.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_off00006c56.bin
04f7eb4138a12663e9b97e4cda085a9bc6b8e5f98ab150888c05dc74c98a50f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C56 5244 bytes
font_01_sfnt_off00007e24.bin
ab968643a68ebb94aee631fe61f5161d39b6276f0cdd38960d2fcdb10b1faaad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E24 9568 bytes