Malicious PDF — malware analysis report

Static analysis result for SHA-256 547e661ddf0d96c6…

MALICIOUS

PDF

75.2 KB Created: 2020-08-20 22:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2067b7c6fff81ea7a4d8bc4f78bb2476 SHA-1: 8c6d0a2cec48b32c80db8bd2a27ddad04b78f6cc SHA-256: 547e661ddf0d96c64adb7bc179bd1b3c999ab394e4b67e6ff94045c051ac8877
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic firing and the embedded link, suggesting a lure to download a file. No scripts were extracted from this sample.

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/pify?keyword=types+of+building+automation+systems+pdf
    • http://files.ambassadormoris.com/uploads/1/3/1/4/131454012/5acce049f6.pdf
    • http://tefixe.lasaniarestaurant.com/uploads/1/3/1/6/131606289/sawimuxerojimevurel.pdf
    • http://files.decaturumc.com/uploads/1/3/0/7/130776423/xakelumowuwomok.pdf
    • http://files.chicagocomics.com/uploads/1/3/0/7/130775387/posikajezi_dokuwova.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/alejandra_pizarnik_diario.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/revista_atualidades_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/misudugomurari.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/luzifetubaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2523/files/abu_hamid_al_ghazali_livre.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/30816443169.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/82129951132.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/valotalavemanufadu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/cinema_hd_app_android.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_off0000e928.bin
d78f070a74b50c523aad8f600bb0cd89c5cbd396007d95c88c652211fe6edb46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 5456 bytes
font_01_sfnt_off0000fbaf.bin
3b7298b6ab8aa0523eab1d4d1c9eb526b9f73a56d4072ad1cc6e43168426a056
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 10520 bytes