Malicious PDF — malware analysis report

Static analysis result for SHA-256 18949e76b5699626…

MALICIOUS

PDF

39.4 KB Created: 2020-08-08 15:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdff84b39ea419adebc30195cc9acbee SHA-1: 82d5f42176854b8f62294b8c26268da6b0a66702 SHA-256: 18949e76b569962658afd7f20d5db9b107fe2288e3d421f0d8f0ab96c1be0d76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a manual, which is likely a lure to encourage users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful infrastructure.

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/wb?keyword=seaward%20primetest%2050%20manual
    • http://files.ryanhayford.com/uploads/1/3/0/7/130776852/9434700.pdf
    • http://files.advanceagritech.com/uploads/1/3/1/3/131380777/ffdd51c7.pdf
    • http://files.sustainablerecovery.net/uploads/1/3/1/3/131380445/nipubufiv.pdf
    • http://wafepinel.coloradovideoartisans.com/uploads/1/3/1/6/131606260/femuwarenumiba.pdf
    • http://files.copa33.org/uploads/1/3/1/4/131411088/5999108.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/vutediliraxerudusotap.pdf
    • https://cdn.shopify.com/s/files/1/0432/5687/3128/files/bobanuwitenurazugugajakul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/tomorrow_we_live_kb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/28979546301.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/bikatapafitesilumasak.pdf
    • https://cdn.shopify.com/s/files/1/0434/9489/9864/files/2272859272.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/99443933921.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8506/files/theorems_of_boolean_algebra_proof.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/metorozuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/backwards_capital_d.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/aadhar_card_online_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ab8.bin
c3ded3fb9bade5b81a252559c8966d28d65f00a4360c7af3ecd3d3c0b7c85013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB8 5568 bytes
font_01_sfnt_off00006da2.bin
8fcf160242f45ce3a0ef7f2120ecf0a8cf0656a4d6532a1f7e038489924a8912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA2 10316 bytes

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