Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05e8e4e5ac401c6…

MALICIOUS

PDF

41.2 KB Created: 2020-08-05 14:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da91cbf6822b97f183799ffd50f36b15 SHA-1: c8a3f01d0fa617f0f2824865a8f45be84e8aa5ad SHA-256: a05e8e4e5ac401c6ac913fbc5029749e30fafcf5d6186ca4ecaf3c35652ef4b6
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=patofisiologi+penyakit+antraks+pdf', which is a known malicious redirector. The PDF also hosts a link farm of other PDFs on Shopify domains, likely for SEO poisoning or to obscure the final malicious destination.

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=patofisiologi+penyakit+antraks+pdf
    • http://files.ryannewtonphotography.co.uk/uploads/1/3/1/4/131437421/9b20222246781.pdf
    • http://files.metaradiant.org/uploads/1/3/2/7/132740515/1021556.pdf
    • http://files.ericbrittmusic.com/uploads/1/3/0/7/130776601/310a8a.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/kubivelopugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekerumukin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/febime.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6285/files/jolulofufudajetewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/4304863745.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/jovedelupidokogevudili.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/8569889087.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/jebafubelolumarive.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/boxijamuxazajufudajino.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7520/files/22728082928.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6473/files/camera_lucida_barthes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/gudexevugilaloputu.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_off0000634d.bin
125d616bcf307fb71b297bcbbca8651d54eb50eda71ca1109925584054046108
pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 5376 bytes
font_01_sfnt_off000075b8.bin
c3f2232dc2265af4f30e227ff473c7f7350625f905bc371d46239c56b1425824
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B8 9900 bytes