Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba2b6112163e2e8…

MALICIOUS

PDF

48.1 KB Created: 2020-08-16 23:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31bf6ade6c94dec641a360dcd71c7fd SHA-1: 202fcfa0bdafb94786447b79522ebcb3604c7b55 SHA-256: 9ba2b6112163e2e8e995ae3c1a079ab8c4630a518fd4569535d8134dbf868c8b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to obscure the final destination. The document body and heuristics indicate a lure related to 'activesheet. paste not working vba', suggesting a pretext to get the user to click the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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=activesheet.+paste+not+working+vba
    • http://files.stfrancisresourcectr.org/uploads/1/3/0/9/130969408/c315433.pdf
    • http://files.getsprinkledbynature.com/uploads/1/3/0/7/130738771/jimurewex.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/kefazuter.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/lakavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/20122928046.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/muzabef.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/bupoduserepumujekiro.pdf
    • https://cdn.shopify.com/s/files/1/0437/1703/4134/files/akuntansi_keperilakuan_jurnal.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4711/files/razewejilamogobafeduj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/p_touch_cube.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_off00007c84.bin
f470a10f7f3c7b2997e59cfbac69df15dcf02058998cd758454b03649cc8a4f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C84 5540 bytes
font_01_sfnt_off00008f6a.bin
7da554172d58f96c5d69aa5b414400171b1a9ccb95da3b1d9d99cc3624677751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 10748 bytes

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