Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148603fa3d708cc…

MALICIOUS

PDF

45.5 KB Created: 2020-09-08 02:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd75e944014fdcf3c67c864d8cb450c SHA-1: cce8afb4d47049c4074e706caa67239abed0b4ad SHA-256: 9148603fa3d708cc22bb9dca7049b81ecf86e6af16d88360d116c08f13f4334d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on shopify.com. One of these links, 'https://ttraff.link/wix?keyword=is+architecture+an+art+form', is identified as a malicious redirector. The document body, though partially corrupted, contains the same question as the URL, suggesting a social engineering lure. The presence of numerous links and the malicious redirector indicate an attempt to lead the user to malicious content.

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.link/wix?keyword=is+architecture+an+art+form
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/black_and_decker_18v_weed_eater.pdf
    • https://cdn.shopify.com/s/files/1/0436/9681/6282/files/wimozobezufixamewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/77390330448.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4e60a866d5641c7a107ae86a43722e5.pdf
    • https://static.usrfiles.com/ugd/135178_fe4db3e565bc424894dc6ad30f3159b4.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_dcd480af1e134e24b7791fe8472801c5.pdf
    • https://static.usrfiles.com/ugd/af0aa9_27f8aaeeb56a4d7692b6e246d85ceb10.pdf
    • https://static.usrfiles.com/ugd/dcfb95_bdb96cc4e9c54fecb6224c2738b8d34a.pdf
    • https://static.usrfiles.com/ugd/733c1f_fef578ebfb824099b64ad999931e3b17.pdf
    • https://static.usrfiles.com/ugd/b8c837_453b49a91bbe4ca78793cb8de7d4e7ab.pdf
    • https://static.usrfiles.com/ugd/35e1ce_27c38861e5084eb6bbd7f1870e7ce920.pdf
    • https://static.usrfiles.com/ugd/9bd82e_38a8f6ba44c04fd493f649b4769ca4b4.pdf
    • https://static.usrfiles.com/ugd/55e2c6_8382a37f5e924915b8f432579530007c.pdf
    • https://cdn.shopify.com/s/files/1/0450/9630/4803/files/81026451092.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4405/files/bluetooth_calling_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/80277196732.pdf
    • https://cdn.shopify.com/s/files/1/0435/8402/8833/files/herman_bavinck_reformed_dogmatics_download.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_off000073ba.bin
b463a6eb7da14032b76b92efaaf44fdff72e88abdb9f6c8563bd37e93d19f4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BA 5024 bytes
font_01_sfnt_off000084a8.bin
492c222ef8aa24b4aeb194b3d53b3e3cb425eae526814dd25284a565bbb325c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A8 10924 bytes

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