Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e277606d59cd89a…

MALICIOUS

PDF

48.0 KB Created: 2020-08-15 04:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32c377f2197ac17e67c9ea519c8f359d SHA-1: 5b7a9802245e7f0b1907cf500a0eec8f81e4231f SHA-256: 5e277606d59cd89a612c82b7e0984418e35313477cf9210f265cb98680ca40fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to drive traffic to malicious infrastructure. 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=hard+callus+formation+x+ray
    • http://files.cecanterbury.org/uploads/1/3/1/4/131454766/37d4fd673.pdf
    • http://files.parksideict.com/uploads/1/3/1/3/131381480/2161488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8103/9013/files/xilawezivunar.pdf
    • https://cdn.shopify.com/s/files/1/0446/9522/4473/files/platform_9_3_4_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/miraxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/99582933592.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/49388976041.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/que_es_la_anemia_y_tipos_de_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0437/3010/8577/files/68571960058.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/attitudinal_and_behavioral_loyalty.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/vurivuxivibumoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/lotiwogix.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f79.bin
66d57e2ae56ff6745c113d221cbfc12bf21305c7d253219ec71a9f6cfd4a9e30
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F79 5300 bytes
font_01_sfnt_off00009168.bin
115cc9239398a6f8bf7e88e71fa41e2f479323f5a03db965d553ebc236a176e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9168 9816 bytes