Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee43b305417b1c08…

MALICIOUS

PDF

70.2 KB Created: 2020-08-24 00:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9e59ecd9e610f8f55018efc6be5006 SHA-1: e8a9a089d2bccfb2eb360b29076fedb39e626d57 SHA-256: ee43b305417b1c086403f8b29c58838d734f32596caade03d00e2c5483a0fea5
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.com/pify?keyword=kdigo+ckd+guidelines, is likely used to funnel victims to further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=kdigo+ckd+guidelines
    • http://xuxuwowi.christineomalley.com/uploads/1/3/0/8/130874276/4bcf4f706.pdf
    • http://files.kindred-connection.com/uploads/1/3/0/8/130874354/ef284a3d93.pdf
    • http://files.lyndonstatesga.com/uploads/1/3/2/7/132712324/fejotugenifa-watikizar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/amor_a_dois_andrei_moreira.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/sodolunesixuniwafifozijez.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/funimenefisij.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/89088092666.pdf
    • https://cdn.shopify.com/s/files/1/0434/3257/5132/files/24838803217.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/58735802648.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/bikini_body_guide_food_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/pitorepobalakiruko.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/32418085860.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/71641111468.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/
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/sodolun

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b3.bin
4892ccc7d4e313b98781fea7b7b74c3785bb6527f796d73d0c5129353ef5d628
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 4836 bytes
font_01_sfnt_off0000d23a.bin
cbe850f3a33d57cd1fc2bb2ad7592123a78dd89f337327f7cb5bdb694b14775d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 10396 bytes
font_02_sfnt_off0000f601.bin
ca283c46b3c9bd5c908c251a3926aa6e8a66e9b69d7ae241d46e273cf24a2221
pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16320 bytes