Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf6f5226bf556e0…

MALICIOUS

PDF

38.7 KB Created: 2020-08-31 23:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f6a83724f7cca73bbfdb8871d19f29 SHA-1: 5e5cc757234ff71067731a20a6f799c6d4d25d70 SHA-256: daf6f5226bf556e01c723b5917362c487e1c5f00521d9f9db25197fef648d076
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains the text 'Nih reporter login' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a user clicking the embedded malicious link.

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=nih+reporter+login
    • https://static.usrfiles.com/ugd/eaf48f_fbcf97b6d6ab41289eec6f186c3cd791.pdf
    • https://static.usrfiles.com/ugd/b8c837_481fd52dcf924852a2f012dfa21719c0.pdf
    • https://static.usrfiles.com/ugd/97634b_cd09cf92dbc1425381c5d4313b6cb6b3.pdf
    • https://static.usrfiles.com/ugd/086daf_9b1b806fbaf5423091547be9f68859f3.pdf
    • https://static.usrfiles.com/ugd/544c7e_9fc40448a92141759a0182c39d4fddc3.pdf
    • https://static.usrfiles.com/ugd/e1c37d_5f5a0cdc875a459896e864731ae21845.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_6bf6d91624a64549a5b35c9303feed7b.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/91836629798.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7916/files/card_games_for_2_players.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/digivujoruxuveporideji.pdf
    • https://static.usrfiles.com/ugd/60933b_be20e8ad67ea4fa389891b7dd0f47bb0.pdf
    • https://static.usrfiles.com/ugd/ca300b_bf9d7a81419d46b295b3f17f433917d3.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_off00005a96.bin
1ac404cbdbf64a87c6983ad67de72618a775eb8059e40db5ad5d5c1e126dacae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 4660 bytes
font_01_sfnt_off00006a75.bin
761620d3ca8daabedff86d9b48be811d2230b7b4a793be574f6d92969f55c86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A75 10628 bytes

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