Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b886be412656165…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 14:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f20604391129a7a87c82e188810323d SHA-1: 0aef0408afc4fe78dbf5f9dca2b09d4fe7339af5 SHA-256: 3b886be41265616523b1186cd07f87153f9134c1163c9d1292aeae9400b965c8
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic suggest a redirection or SEO-based attack. 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.com/wix?keyword=helltooth+set+dungeon+location
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/14419078056.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8656/files/jarovudoduxute.pdf
    • https://cdn.shopify.com/s/files/1/0437/2765/0970/files/ruxabazesifamurekoritosi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/75432839754.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3827d2f22e747abb5cf2996a32983b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_1194370f7fe24c9aae7dbc812492f2fd.pdf
    • https://cdn.shopify.com/s/files/1/0465/9373/6869/files/campbell_biology_8th_edition_ting_vit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/chillerama_2011_subtitle_indonesia.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e8da7c8c22a446daf85dfdd6e88f652.pdf
    • https://static.usrfiles.com/ugd/95089d_f636be57777546dcbc536c1e102e953c.pdf
    • https://static.usrfiles.com/ugd/89363e_afd673341de64b49bff2d777b10a708e.pdf
    • https://static.usrfiles.com/ugd/b8c837_353b0119927641cb82803edbdeb8fc6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf4b339f1a4347c79ef99a2861765bba.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_off0000612b.bin
081aefc12db86febad7154ade6994619e56bad2aba7ebe8f0a31a72ed7690adf
pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 5064 bytes
font_01_sfnt_off0000725b.bin
b9923b59379c60c27b3433b866fd6e6fed9967030acaa69ad27383476043228e
pdf-font-stream PDF embedded font (sfnt) at offset 0x725B 10692 bytes