Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b06f70b551365c4…

MALICIOUS

PDF

36.7 KB Created: 2020-07-13 23:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151e93c6c80eb15744bf748a378a6192 SHA-1: 81a262ec288617fa2bed03309d15438c3186089d SHA-256: 9b06f70b551365c4c3a27468ddafaaf51bcf3d3e0c5f482e72d0b6a93e12a57f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure for a 'solution manual'. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a link farm, likely for SEO poisoning to attract victims. The ML classifier strongly flagged this PDF as malicious.

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=signal%20and%20system%202nd%20edition%20solution%20manual
    • http://files.summit-import.com/uploads/1/3/2/3/132302919/8348862.pdf
    • http://files.bertriedel.com/uploads/1/3/0/7/130775867/wivexe.pdf
    • http://files.pennumc.org/uploads/1/3/2/6/132695629/582661e2.pdf
    • http://files.cpubfl.com/uploads/1/3/0/7/130739313/5d3a2ec.pdf
    • http://files.cliffgloverpottery.com/uploads/1/3/1/3/131379552/916ca479f4.pdf
    • https://nubudin.files.wordpress.com/2020/06/jugupuwipapibobitame.pdf
    • https://verepekom.files.wordpress.com/2020/07/vitunagudasizokona.pdf
    • https://besolofebuna.files.wordpress.com/2020/06/83400981560.pdf
    • https://tenafixufuvo.files.wordpress.com/2020/06/56209240343.pdf
    • https://nogonig497746126.files.wordpress.com/2020/07/6080859441.pdf
    • https://wijikud.files.wordpress.com/2020/07/9368435101.pdf
    • https://sotetusuveti.files.wordpress.com/2020/06/27869381969.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/97482903787.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/vokitolagopom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/xupevajor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4346/3074/files/luruvewu.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_off00005650.bin
f2bb7e7cb81ba7bb9e36ed3c235d51b7c21daf12dc87bc467484c4aa52eff1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5650 5268 bytes
font_01_sfnt_off00006820.bin
172fadab322aa17c0b84c38996d81eb2b99cdf817caa1f1f66b468fabc9be6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 8548 bytes

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