Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51c90de5f03e23d…

MALICIOUS

PDF

70.3 KB Created: 2020-08-02 20:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9082a3d32a776d7f5001996346fec36 SHA-1: a01257c78909e26178160c7e27a463f1d8b6e517 SHA-256: c51c90de5f03e23d694999535583efc25d0c8e8b75d37e1753ccc84d276f2d44
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for phishing or malware distribution. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'ttraff.com', indicating a malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many pointing to Shopify-hosted PDFs, suggesting an attempt to create a link farm or distribute further content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this document.

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/pify?keyword=single+line+ascii+art
    • http://files.thewolfofwaverlyplace.com/uploads/1/3/0/7/130738722/8090319.pdf
    • http://files.astarboards.com/uploads/1/3/1/8/131856333/votimerovodarexo.pdf
    • http://files.onbecomingesther.com/uploads/1/3/0/8/130814063/23b6834c.pdf
    • http://files.newnextsf.com/uploads/1/3/1/8/131871692/wenuzilif.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/mysql_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/gijotenerasuzufis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/dawogisexatafepite.pdf
    • https://cdn.shopify.com/s/files/1/0434/5079/4145/files/xadadafete.pdf
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/90734777847.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/55664196658.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/8531723653.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/witasonodutilenirusasefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/22209387871.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00009368.bin
f930b9911e9640bd8b8d81759c3fade2d61b28df98256a7261ad24f1da5cabc5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9368 1788 bytes
font_00_sfnt_off00006b0e.bin
0835e99f4d84aa03cd30cb03f7f1d76a80cf16adebd9bfbc21a00dbaac41bc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0E 3676 bytes
font_01_sfnt_off00007832.bin
9309d8fe44f5cb85c3bd2ad80e44396b4b67124b4f094f31b82ad147adbaa4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7832 5072 bytes
font_02_sfnt_off0000897a.bin
0862e89ad58e7f1a0d018bdde91276dde0c1499341f426941c024f45bfc883b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897A 2316 bytes
font_04_sfnt_off00009c94.bin
5001ebfd58343b6cce3c98bec2112a96dd39c5a072d6a07fb6ea8707a672bb81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C94 20156 bytes
font_05_sfnt_off0000dafe.bin
cc613be2f4bdf6a134db04696973e980f7ebfe3ef6c6342d2debff6af20ae9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 24184 bytes

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