Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca17f1a39c2cf46…

MALICIOUS

PDF

59.4 KB Created: 2020-07-16 03:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda177ff0fe4f98bd4749ce1a71077b0 SHA-1: f522d91fca33e42330fea2664289550dca24c354 SHA-256: 6ca17f1a39c2cf46e65189eefe53f4e16315703be2b887d9b5d59b4b3c6f4f51
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a redirector to malicious infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links, including one pointing to a known malicious redirector, suggests an attempt to lure users to malicious sites for phishing or malware delivery.

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.cc/wb?keyword=rcp%202019%20pdf
    • http://files.laurenandmikeries.com/uploads/1/3/1/3/131380001/617676.pdf
    • http://files.tayhossdesigns.com/uploads/1/3/1/1/131164272/gizazexo.pdf
    • http://files.fonpape.com/uploads/1/3/1/6/131636890/b1ea201.pdf
    • http://files.mattkinsell.com/uploads/1/3/2/6/132683069/8888557.pdf
    • http://files.sandstormvault.com/uploads/1/3/0/7/130739945/nozoxusegoz_posulubiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/sagufejusonevizowaladox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/vozarufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91428743782.pdf
    • https://sadobibelor.files.wordpress.com/2020/06/dafebijegusudanigukigaba.pdf
    • https://jumosor.files.wordpress.com/2020/06/46426630962.pdf
    • https://domunilide.files.wordpress.com/2020/06/82853990086.pdf
    • https://jezowiv.files.wordpress.com/2020/07/paxokemudafel.pdf
    • https://kuxogufebaji.files.wordpress.com/2020/06/dibekepududufub.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/vonodaxake.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/59355734287.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/tisikojukafewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/4667254952.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/92255133457.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/resupanuniromadufalibatus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65925238695.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/15240847232.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_off0000adb7.bin
a834b3e75542515503eacfe1e76683205cb41860838a9d8aa907f49b6ef5a68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADB7 4448 bytes
font_01_sfnt_off0000bcde.bin
2394dee403e7de26a18767edf9237d3241baf7bd6841082169afc829fa0f8399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDE 10352 bytes

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