Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d28792f6ce2832…

MALICIOUS

PDF

62.5 KB Created: 2020-08-29 17:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22156039083fe2d25903277d002fb438 SHA-1: 95fa6db99782eff08b3be23e2fee127018a7df3b SHA-256: d3d28792f6ce2832fab4aa3b73eea791ceaf8f989c0606fe72f1435fb74e9451
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The primary malicious URL identified is https://ttraff.com/wix?keyword=despues+de+la+caida+felix+perez+lebr. The document body contains garbled text and the authoring application is wkhtmltopdf, suggesting it was programmatically generated.

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=despues+de+la+caida+felix+perez+lebr
    • https://static.usrfiles.com/ugd/0a593f_1e5176a216a147659761c529120b1604.pdf
    • https://static.usrfiles.com/ugd/b8c837_1681138beec549f89663bdb1f729f914.pdf
    • https://static.usrfiles.com/ugd/b8c837_627f96bf1c454a9d8d855841d8b2b7e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1203834decad448b98ae5f210da8ec49.pdf
    • https://static.usrfiles.com/ugd/b8c837_899261e3a06544babf69a1b4229066d1.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/xeliga.pdf
    • https://cdn.shopify.com/s/files/1/0429/4633/0791/files/10004011017.pdf
    • https://cdn.shopify.com/s/files/1/0463/6173/9419/files/mcsa_windows_server_2016_study_guide_exam_70-740_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5721/files/67714053791.pdf
    • https://cdn.shopify.com/s/files/1/0446/2955/7411/files/balance_sheet_to_excel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/xupumevodakemuxidizeleru.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/59633565933.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/xomewiwefilurudakadoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/john_deere_7000_planter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0459/6210/0896/files/kled_mobafire_guide.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_off0000b1be.bin
f732ed0d9146b5004f0861933b0b19d32ff1c1969eed312a537ade39da0367a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 5404 bytes
font_01_sfnt_off0000c434.bin
59340264d6f3ffd58d518353cbfbdbeef6ec69bf341ce1f364b4402ff16ace43
pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 11956 bytes